A horizontal straight wire of length 40 mm is in an east-west direction as shown in the diagram. A uniform magnetic field of flux density 50 mT is directed downwards into the plane of the diagram. When a current of 5.0 A passes through the wire from west to east, a horizontal force acts on the wire. Which line, A to D , in the table gives the magnitude and direction of this force?

magnitude / mN: 10.0 direction: north

magnitude / mN: 2.0 direction: north

magnitude / mN: 2.0 direction: south

magnitude / mN: 10.0 direction: south

A coil, mounted on an axle, has its plane parallel to the flux lines of a uniform magnetic field B , as shown. When a current I is switched on, and before the coil is allowed to move,

there are no forces due to B on the sides PQ and RS.

there are no forces due to B on the sides SP and QR.

sides SP and QR attract each other.

sides PQ and RS attract each other.

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.

A beam of positive ions enters a region of uniform magnetic field, causing the beam to change direction as shown in the diagram. What is the direction of the magnetic field?

out of the page and perpendicular to it

into the page and perpendicular to it

in the direction indicated by + y

in the direction indicated by - y

A negatively charged particle moves at right angles to a uniform magnetic field. The magnetic force on the particle acts

in the opposite direction to that of the field.

at an angle between 0° and 90° to the field.

An electron moving with a constant speed enters a uniform magnetic field in a direction perpendicular to the magnetic field. What is the shape of the path that the electron would follow?

a line parallel to the magnetic field

An electron moving with a constant speed enters a uniform magnetic field in a direction at right angles to the field. What is the subsequent path of the electron?

A circular arc in a plane perpendicular to the direction of the field.

A straight line in the direction of the field.

A straight line in a direction opposite to that of the field.

An elliptical arc in a plane perpendicular to the direction of the field.

A jet of air carrying positively charged particles is directed horizontally between the poles of a strong magnet, as shown in the diagram. In which direction are the charged particles deflected?

towards the N pole of the magnet

towards the S pole of the magnet

An electron moves due North in a horizontal plane with uniform speed. It enters a uniform magnetic field directed due South in the same plane. Which one of the following statements concerning the motion of the electron in the magnetic field is correct?

It continues to move North with its original speed.

It slows down to zero speed and then accelerates due South.

An electron moves due North in a horizontal plane with uniform speed. It enters a uniform magnetic field directed due South in the same plane. Which one of the following statements concerning the motion of the electron in the magnetic field is correct?

It continues to move North with its original speed.

It slows down to zero speed and then accelerates due South.

An electron moves into a region of uniform magnetic flux density between the poles of a magnet as shown in the diagram. The deflection of the electron will be

perpendicular to the plane of the paper away from you

perpendicular to the plane of the paper towards you

A bar magnet is pushed into a coil connected to a sensitive ammeter, as shown in the diagram, until it comes to rest inside the coil. Why does the ammeter briefly show a non-zero reading?

The magnetic flux linkage in the coil increases then becomes constant.

The magnetic flux linkage in the coil increases then decreases.

The magnetic flux linkage in the coil decreases then increases.

The magnetic flux linkage in the coil decreases then becomes constant.(

A coil of 50 turns has a cross-sectional area of 4.2 × 10 –3 m 2 . It is placed at an angle to a uniform magnetic field of flux density 2.8 × 10 –2 T, as shown in the diagram, so that angle θ = 50°. What is the change in flux linkage when the coil is rotated anticlockwise until θ = 0°?

The flux linkage increases by 2.1 × 10 –3 Wb turns.

The flux linkage decreases by 2.1 × 10 –3 Wb turns.

The flux linkage decreases by 3.8 × 10 –3 Wb turns.

The flux linkage increases by 3.8 × 10 –3 Wb turns.

The graph shows how the magnetic flux passing through a loop of wire changes with time. What feature of the graph represents the magnitude of the emf induced in the coil?

the area enclosed between the graph line and the time axis

the area enclosed between the graph line and the magnetic flux axis

the inverse of the gradient of the graph

Three identical magnets P, Q and R are released simultaneously from rest and fall to the ground from the same height. P falls directly to the ground. Q falls through the centre of a thick horizontal conducting ring. R falls through a similar ring that has a gap cut into it. In which order do the magnets reach the ground?

P and R arrive together, followed by Q.

P and Q arrive together, followed by R.

P arrives first, followed by Q which is followed by R.

All three magnets arrive simultaneously.

The graph shows how the flux linkage, NΦ, through a coil changes when the coil is moved into a magnetic field. The emf induced in the coil

is constant then becomes zero after time t 0 .

decreases then becomes zero after time t 0 .

increases then becomes constant after time t 0 .

is zero then increases after time t 0 .

In which one of the following applications does electromagnetic induction not take place?

the back up capacitor of an electric timer

the generators at a nuclear power station

the ac power adapter for a laptop computer

the wings of an aircraft cutting through the Earth’s magnetic field

Charge and Magnetic Field

Authored by Charles Martinez

Physics

12th Grade

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram shows a clockwise current I in a circular coil placed in a uniform magnetic field B with the plane of the coil perpendicular to the magnetic field.
What is the effect on the coil of the interaction between the current and the magnetic field?

It rotates about the axis with the top moving out of the page.

It rotates about the axis with the top moving into the page.

It causes an increase in the diameter of the coil.

It causes a decrease in the diameter of the coil.

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A horizontal copper wire of mass 4.0 × 10⁻³ kg and length 80 mm is placed perpendicular to a horizontal magnetic field of flux density 0.16 T. The magnetic force acting on the wire supports the weight of the wire.

How many electrons are passing a point in the wire in each second?

1.9 × 10¹⁸

1.9 × 10¹⁹

1.9 × 10²⁰

1.9 × 10²¹

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A horizontal straight wire of length 0.30 m carries a current of 2.0 A perpendicular to a horizontal uniform magnetic field of flux density 5.0 × 10^–2 T. The wire ‘floats’ in equilibrium in the field.

What is the mass of the wire?

8.0 × 10^–4 kg

3.1 × 10^–3 kg

3.0 × 10^–2 kg

8.2 × 10^–1 kg

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram shows a horizontal conductor of length 50 mm carrying a current of 3.0 A at right angles to a uniform horizontal magnetic field of flux density 0.50 T.

What is the magnitude and direction of the magnetic force on the conductor ?

0.075 N vertically upwards

0.075 N vertically downwards

75 N vertically upwards

75 N vertically downwards

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram shows a rigidly-clamped straight horizontal current-carrying wire held mid-way between the poles of a magnet on a top-pan balance. The wire is perpendicular to the magnetic field direction.

The balance, which was zeroed before the switch was closed, read 161 g after the switch was closed. When the current is reversed and doubled, what would be the new reading on the balance?

−322 g

−161 g

zero

322 g

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Four rectangular loops of wire A, B, C and D are each placed in a uniform magnetic field of the same flux density B. The direction of the magnetic field is parallel to the plane of the loops as shown.

When a current of 1 A is passed through each of the loops, magnetic forces act on them. The lengths of the sides of the loops are as shown. Which loop experiences the largest couple?

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NGSS.HS-PS3-5

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The diagram shows a vertical square coil whose plane is at right angles to a horizontal uniform magnetic field B. A current, I, is passed through the coil, which is free to rotate about a vertical axis OO'.

Which one of the following statements is correct?

The forces on the two vertical sides of the coil are equal and opposite.

A couple acts on the coil.

No forces act on the horizontal sides of the coil.

If the coil is turned through a small angle about OO' and released, it will remain in position.

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

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Charge and Magnetic Field

The diagram shows a clockwise current I in a circular coil placed in a uniform magnetic field B with the plane of the coil perpendicular to the magnetic field. What is the effect on the coil of the interaction between the current and the magnetic field?

A horizontal copper wire of mass 4.0 × 10−3 kg and length 80 mm is placed perpendicular to a horizontal magnetic field of flux density 0.16 T. The magnetic force acting on the wire supports the weight of the wire.How many electrons are passing a point in the wire in each second?

A horizontal straight wire of length 0.30 m carries a current of 2.0 A perpendicular to a horizontal uniform magnetic field of flux density 5.0 × 10–2 T. The wire ‘floats’ in equilibrium in the field.What is the mass of the wire?

The diagram shows a horizontal conductor of length 50 mm carrying a current of 3.0 A at right angles to a uniform horizontal magnetic field of flux density 0.50 T.What is the magnitude and direction of the magnetic force on the conductor ?

The diagram shows a vertical square coil whose plane is at right angles to a horizontal uniform magnetic field B. A current, I, is passed through the coil, which is free to rotate about a vertical axis OO'. Which one of the following statements is correct?

A horizontal straight wire of length 0.30 m carries a current of 2.0 A perpendicular to a horizontal uniform magnetic field of flux density 5.0 × 10–2 T. The wire ‘floats’ in equilibrium in the field.What is the mass of the wire?

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The diagram shows a clockwise current I in a circular coil placed in a uniform magnetic field B with the plane of the coil perpendicular to the magnetic field.
What is the effect on the coil of the interaction between the current and the magnetic field?

A horizontal copper wire of mass 4.0 × 10⁻³ kg and length 80 mm is placed perpendicular to a horizontal magnetic field of flux density 0.16 T. The magnetic force acting on the wire supports the weight of the wire.

How many electrons are passing a point in the wire in each second?

A horizontal straight wire of length 0.30 m carries a current of 2.0 A perpendicular to a horizontal uniform magnetic field of flux density 5.0 × 10^–2 T. The wire ‘floats’ in equilibrium in the field.

What is the mass of the wire?

The diagram shows a horizontal conductor of length 50 mm carrying a current of 3.0 A at right angles to a uniform horizontal magnetic field of flux density 0.50 T.

What is the magnitude and direction of the magnetic force on the conductor ?

The diagram shows a vertical square coil whose plane is at right angles to a horizontal uniform magnetic field B. A current, I, is passed through the coil, which is free to rotate about a vertical axis OO'.

Which one of the following statements is correct?

A horizontal straight wire of length 0.30 m carries a current of 2.0 A perpendicular to a horizontal uniform magnetic field of flux density 5.0 × 10^–2 T. The wire ‘floats’ in equilibrium in the field.

What is the mass of the wire?