A parallel-plate capacitor is fully charged and then disconnected from the power supply. A dielectric is then inserted between the plates. Which row correctly identifies the charge on the plates and the electric field strength between the plates?

Charge: Stays the same Electric field strength: Decreases

Charge: Stays the same Electric field strength: Increases

Charge: Increases Electric field strength: Decreases

Charge: Increases Electric field strength: Increases

An electron moving with constant speed enters a uniform electric field at right angles to the direction of the field. What is true about the force acting on the electron?

It is in the opposite direction to the direction of the field.

It is at right angles to the direction of the field.

It causes the electron to continue in the same direction with its speed increasing steadily.

It causes the electron to continue in the same direction with its speed decreasing steadily.

Two fixed parallel metal plates P and Q are at constant electrical potentials of +100 V and +70 V respectively. A proton travelling from P to Q experiences a force F due to the electric field between P and Q , and a change of potential energy of Δ E p . Which line, A to B , in the table gives the direction of F and the value of Δ E p ?

Direction of F: towards Q Δ E p : -30 eV

Direction of F: towards P Δ E p : +30 eV

Direction of F: towards Q Δ E p : +30 eV

Direction of F: towards P Δ E p : -30 eV

The diagram shows a small negative charge at a point in an electric field, which is represented by the arrowed field lines. Which of the following statements, about what happens when the charge is displaced, is correct? When the negative charge is displaced

along the line PQ towards P the magnitude of the electric force on it is unchanged.

to the left the magnitude of the electric force on it decreases.

to the right its potential energy increases.

along the line PQ towards Q its potential energy decreases.

Which of the following statements about a parallel plate capacitor is incorrect ?

The charge stored on the capacitor is inversely proportional to the pd across the plates.

The capacitance of the capacitor is the amount of charge stored by the capacitor when the pd across the plates is 1 V.

A uniform electric field exists between the plates of the capacitor.

The energy stored when the capacitor is fully charged is proportional to the square of the pd across the plates.

A satellite orbiting the Earth moves to an orbit which is closer to the Earth. Which line shows correctly what happens to the speed of the satellite and to the time it takes for one orbit of the Earth?

Speed of satellite: increases Time For One Orbit Of Earth: decreases

Speed of satellite: decreases Time For One Orbit Of Earth: decreases

Speed of satellite: decreases Time For One Orbit Of Earth: increases

Speed of satellite: increases Time For One Orbit Of Earth: increases

Which one of the following statements is correct? An electron follows a circular path when it is moving at right angles to

uniform electric and magnetic fields which are perpendicular.

uniform electric and magnetic fields which are in opposite directions.

Which one of the following statements is correct? The force between two charged particles

can be measured in C 2 F –1 m –1

is directly proportional to the distance between them

is independent of the magnitude of the charges

Which one of the following statements is correct? When a negative ion is projected into an electric field

the field can change both the magnitude and the direction of the velocity

the field can change the magnitude of the velocity but not its direction

the field can change the direction of the velocity but not its magnitude

the ion will accelerate in the direction of the field

The diagram shows a negative ion at a point in an electric field, which is represented by the arrowed field lines. Which one of the following statements correctly describes what happens when the ion is displaced? When the negative ion is displaced

along the line PQ towards P the magnitude of the electric force on it is unchanged.

to the left the magnitude of the electric force on it decreases.

to the right its potential energy increases.

along the line PQ towards Q its potential energy decreases.

Which one of the following statements about a parallel plate capacitor is incorrect?

The charge stored on the capacitor is inversely proportional to the pd across the plates.

The capacitance of the capacitor is the amount of charge stored by the capacitor when the pd across the plates is 1V.

A uniform electric field exists between the plates of the capacitor.

The energy stored when the capacitor is fully charged is proportional to the square of the pd across the plates.

Which line correctly describes the trajectory of charged particles which enter separately, at right angles, a uniform electric field, and a uniform magnetic field?

uniform electric field: parabolic uniform magnetic field: circular

uniform electric field: circular uniform magnetic field: parabolic

uniform electric field: circular uniform magnetic field: circular

uniform electric field: parabolic uniform magnetic field: parabolic

An ion carrying a charge of +4.8 × 10 –19 C travels horizontally at a speed of 8.0 × 10 5 ms –1 . It enters a uniform vertical electric field of strength 4200 V m –1 , which is directed downwards and acts over a horizontal distance of 0.16m. Which one of the following statements is not correct?

The magnitude of the force exerted on the ion by the field is 1.6 × 10 –9 N.

The ion passes through the field in 2.0 × 10 –7 s.

The force on the ion acts vertically downwards at all points in the field.

The horizontal component of the velocity of the ion is unaffected by the electric field.

Which one of the following statements about a charged particle in an electric field is correct?

No work is done when a charged particle moves along a line of constant potential.

No work is done when a charged particle moves along a field line.

No force acts on a charged particle when it moves along a field line.

No force acts on a charged particle when it moves along a line of constant potential.

Which one of the following statements about electric field strength and electric potential is incorrect ?

Electric potential is zero whenever the electric field strength is zero.

Electric potential is a scalar quantity.

Electric field strength is a vector quantity.

The potential gradient is proportional to the electric field strength.

An electron travelling at constant speed enters a uniform electric field at right angles to the field. While the electron is in the field it accelerates in a direction which is

in the opposite direction to the electric field.

in the same direction as the electric field.

in the same direction as the motion of the electron.

in the opposite direction to the motion of the electron.

If the potential difference between a pair of identical, parallel, conducting plates is known, what is the only additional knowledge required to determine the electric field strength between the plates?

the permittivity of the medium between the plates

the separation and area of the plates

the separation and area of the plates and the permittivity of the medium between the plates

Which one of the following statements about electric field strength and electric potential is incorrect ?

Electric potential is zero whenever the electric field strength is zero.

Electric potential is a scalar quantity.

Electric field strength is a vector quantity.

The potential gradient is proportional to the electric field strength.

Which one of the following statements about electric potential and electric field strength is correct?

Electric potential due to a point charge varies as 1/r where r is the distance from the point charge.

Electric potential is zero whenever the electric field strength is zero.

Electric field strength is a scalar quantity.

Electric potential is a vector quantity.

An electric field is maintained in the region between two circular parallel metal plates, the separation of which is small compared with their diameter. Along the line X to Y between the plates

the electric field strength is the same everywhere

the electric field strength decreases uniformly

the electric field strength increases uniformly

the electric field strength increases and then decreases again

P.3.7.3 - Electric Fields

Authored by Stanton Wertjes

Physics

12th Grade

Used 5+ times

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

The diagram shows the path of an α particle deflected by the nucleus of an atom. Point P on the path is the point of closest approach of the α particle to the nucleus. Which of the following statements about the α particle on this path is correct?

Its acceleration is zero at P.

Its kinetic energy is greatest at P.

Its potential energy is least at P.

Its speed is least at P.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The diagram shows two particles at distance d apart. One particle has charge +Q and the other –2Q. The two particles exert an electrostatic force of attraction, F, on each other. Each particle is then given an additional charge +Q and their separation is increased to distance 2d. Which of the following gives the force that now acts between the two particles?

an attractive force of F/4

a repulsive force of F/4

an attractive force of F/2

a repulsive force of F/2

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A +2.0 nC point charge X is at a fixed distance from a –1.0 nC point charge Y. The force between the two charges is F. If an additional charge of +2.0 nC is supplied to both X and Y, which line gives the magnitude and direction of the force on X?

Magnitude: 2 F

Direction: from X to Y

Magnitude: 4 F

Direction: from X to Y

Magnitude: 2 F

Direction: from Y to X

Magnitude: 4 F

Direction: from Y to X

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The gravitational constant, G, is a constant of proportionality in Newton’s law of gravitation. The permittivity of free space, ε₀, is a constant of proportionality in Coulomb’s law.

When comparing the electrostatic force acting on a pair of charged particles to the gravitational force between them, the product ε₀G can appear in the calculation.

Which is a unit for ε₀G?

C² kg^–2

C² m^–2

F kg² N^–1 m^–2

it has no unit

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Two point charges, X and Y, exert a force F on each other when they are at a distance d apart.

When the distance between them is 20 mm, the force they exert on each other is 0.5 F.

What is the distance d?

7 mm

14 mm

15 mm

28 mm

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Two identical positive point charges, P and Q, separated by a distance r, repel each other with a force F. If r is decreased so that the electrical potential energy of Q is doubled, what is the force of repulsion?

0.5 F

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The force between two point charges is F when they are separated by a distance r.
If the separation is increased to 3r, what is the force between the charges?

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P.3.7.3 - Electric Fields

The diagram shows the path of an α particle deflected by the nucleus of an atom. Point P on the path is the point of closest approach of the α particle to the nucleus. Which of the following statements about the α particle on this path is correct?

A +2.0 nC point charge X is at a fixed distance from a –1.0 nC point charge Y. The force between the two charges is F. If an additional charge of +2.0 nC is supplied to both X and Y, which line gives the magnitude and direction of the force on X?

Two point charges, X and Y, exert a force F on each other when they are at a distance d apart.

When the distance between them is 20 mm, the force they exert on each other is 0.5 F.

What is the distance d?

Two identical positive point charges, P and Q, separated by a distance r, repel each other with a force F. If r is decreased so that the electrical potential energy of Q is doubled, what is the force of repulsion?

The force between two point charges is F when they are separated by a distance r.
If the separation is increased to 3r, what is the force between the charges?

A repulsive force F acts between two positive point charges separated by a distance r. What will be the force between them if each charge is doubled and the distance between them is halved?

A repulsive force F acts between two positive point charges separated by a distance r.
What will be the force between them if each charge is doubled and the distance between them is halved?

The repulsive force between two small negative charges separated by a distance r is F. What is the force between the charges when the separation is reduced to r/3 ?

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P.3.7.3 - Electric Fields

The diagram shows the path of an α particle deflected by the nucleus of an atom. Point P on the path is the point of closest approach of the α particle to the nucleus. Which of the following statements about the α particle on this path is correct?

A +2.0 nC point charge X is at a fixed distance from a –1.0 nC point charge Y. The force between the two charges is F. If an additional charge of +2.0 nC is supplied to both X and Y, which line gives the magnitude and direction of the force on X?

Two point charges, X and Y, exert a force F on each other when they are at a distance d apart. When the distance between them is 20 mm, the force they exert on each other is 0.5 F.What is the distance d?

Two identical positive point charges, P and Q, separated by a distance r, repel each other with a force F. If r is decreased so that the electrical potential energy of Q is doubled, what is the force of repulsion?

The force between two point charges is F when they are separated by a distance r.If the separation is increased to 3r, what is the force between the charges?

A repulsive force F acts between two positive point charges separated by a distance r. What will be the force between them if each charge is doubled and the distance between them is halved?

A repulsive force F acts between two positive point charges separated by a distance r.What will be the force between them if each charge is doubled and the distance between them is halved?

The repulsive force between two small negative charges separated by a distance r is F. What is the force between the charges when the separation is reduced to r/3 ?

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Two point charges, X and Y, exert a force F on each other when they are at a distance d apart.

When the distance between them is 20 mm, the force they exert on each other is 0.5 F.

What is the distance d?

The force between two point charges is F when they are separated by a distance r.
If the separation is increased to 3r, what is the force between the charges?

A repulsive force F acts between two positive point charges separated by a distance r.
What will be the force between them if each charge is doubled and the distance between them is halved?