Free Printable Electric potential

1.

How long would it take for a 240 V stove, running a current of 42 A, to produce 8.4 * 10⁷ J of heat energy?

a)

7 min

b)

82 min

c)

139 min

d)

275 min

2.

Your flashlight spends 6138 J of energy to illuminate an area for 3.2 min. If a current of 2.8 A was used to power the flashlight, what was the flashlight's voltage?

a)

11 V

b)

20 V

c)

47 V

d)

685 V

3.

Your speaker has 70 V uses 817 J of energy to play sound. How much charge does your speaker use?

a)

2 C

b)

7 C

c)

12 C

d)

29 C

4.

An 8.2 V battery supplies 6.2 * 10² C of charge to a fan motor. How much energy does the fan use?

a)

0.013 J

b)

76 J

c)

1693 J

d)

5084 J

5.

A common name for electric potential difference is

a)

electric energy

b)

juice

c)

voltage

d)

current energy

6.

1 volt is equivalent to

a)

J/C

b)

C/J

c)

A/C

d)

m/N

7.

Electric potential difference is measured in

a)

newtons (N)

b)

amps (A)

c)

volts (V)

d)

joules (J)

8.

Which description best describes electric potential difference?

a)

The amount of energy that a charge has.

b)

The amount of energy needed to move a charge from 1 place to another.

c)

The amount of charge that an electron has.

d)

The amount of brightness you observe when looking at a lightbulb.

9.

As a proton moves in the direction the electric field lines...

a)

it is moving from low potential to high potential and gaining electric potential energy.

b)

it is moving from high potential to low potential and gaining electric potential energy.

c)

it is moving from low potential to high potential and losing electric potential energy.

d)

it is moving from high potential to low potential and losing electric potential energy.

10.

Two point charges are separated by a distance of 10 cm. Charge on point A =+9 μC and charge on point B = -4 μC.

[k = 9 x 10⁹Nm²C⁻², 1 μC = 10⁻⁶ C]

What is the electric potential energy between these two charges?

a)

3.24 J

b)

5.54 J

c)

7.23 J

d)

6.45 J

11.

Electric potential and electric potential energy are NOT the same.

a)

TRUE

b)

FALSE

12.

If𝑎=30𝑐𝑚, 𝑏=20𝑐𝑚, 𝑞=+2.0𝑛𝐶, and𝑄= −3.0 𝑛𝐶 in the figure, what is the potential difference

𝑉_A−𝑉_B?

a)

- 20 V

b)

- 48 V

c)

+60 V

d)

+80 V

13.

During a lightning discharge, 30 C of charge move through a potential difference of 1.0 x 10⁸ V in 2.0 x 10^–2 s. The energy released by this lightning bolt is:

a)

1.5 x 10¹¹ J

b)

3.0 x 10⁹ J

c)

6.0 x 10⁷ J

d)

3.3 x 10⁶ J

14.

The potential difference between two points is 100 V. If a particle with a charge of 2 C is transported from one of these points to the other, the magnitude of the work done is:

a)

200 J

b)

100 J

c)

50 J

d)

2 J

15.

9. calculate the capacitance of a parallel plate air capacitor of plate area area 30m 2 , the plates being separated by dielectric 2mm thick and relative permittivity 6

a)

O.797 µF.

b)

0.297 µF.

c)

0.397 µF.

d)

0.497 µF.

16.

8. Net Capacitance of three identical capacitors in series is 1 µF. What will be their net capacitance if connected in parallel ? find the ratio of energy stored in the two configurations if they are both connected in same source

a)

1/9

b)

1/12

c)

1/16

d)

1/3

17.

6. A 4µF is charged by a 200V supply. It is then disconnected from the supply , and is connected to another uncharged 2µF capacitor , how much electrostatics energy of the first capacitor is lost in the form of heat and electromagnetic radiation

a)

167x10-2 J

b)

36.7x10-2 J

c)

7.67x10-2 J

d)

2.67x10-2 J

18.

5. Calculate the capacitance of a parallel plate capacitor, if the area of each plate is 1m2 and the distance of separation of the plates is 1mm

a)

8.853x10-7F

b)

8.853x10-9F

c)

8.853x10-11F

d)

8.853x10-14F

19.

4. Two capacitors of capacitance 6μF , 12μF are connected in series with a battery , the voltage across the 6μF capacitor is 2V Compute the total battery voltage

a)

1V

b)

2V

c)

3V

d)

4V

20.

3. A parallel plate capacitor with air b/w plate has capacitance of 8pF , what will be the capacitance , if the distance between the plate is reduced by half and space between them is filled with substance of dielectric constant is 6

a)

16pF

b)

36pF

c)

96pF

d)

86pF

21.

2. 12pF capacitor is connected to 50V battery , How Much electrostatics energy is stored in the capacitor

a)

1.5x10-8J

b)

1.5x10-9J

c)

1.5x10-10J

d)

1.5x10-11J

e)

Option 5

22.

Electric potential at a point due to a dipole is

a)

$\frac{1}{4πε_o}\ \frac{p⃗.r⃗}{r^3}$

b)

$\frac{1}{4πε_o}\ \frac{p⃗.r⃗}{r^2}$

c)

$\frac{1}{4πε_o}\ \frac{p⃗.r⃗}{r}$

d)

$\frac{1}{4πε_o}\ p⃗.r⃗$

23.

The expression for Electric potential due to a point charge at a distance 'r' from it is____________

a)

$\frac{1}{4\pi\epsilon\ _{0\ }}\ \frac{q^{2\ }}{r}$

b)

$\frac{1}{4\pi\epsilon\ _{0\ }}\ \frac{q}{r}$

c)

$\frac{1}{4\pi\epsilon\ _{0\ }}\ \frac{q^{2\ }}{r^2}$

d)

$\frac{1}{4\pi\epsilon\ _{0\ }}\ \frac{q\ }{r^2}$

24.

Which of the following statement is not true

a)

Electrostatic force is a conservative force.

b)

Potential at a point is the work done per unit charge in bringing a charge from infinity to that point in an electric field

c)

Electrostatic force is non-conservative

d)

Potential is the ratio of work to charge.

25.

What should be Capacitance of a capacitor capable of storing 1J of energy when potential difference of 100V is applied between the plates

a)

1x10^-4F

b)

2x10^-4F

c)

3x10^-4F

d)

4x10^-4F

26.

A cube of side √3 m charge of 1microcoulomb at each of its eight vertices Find the Potential and electric field at the centre of Cube

a)

48x10³V , zero

b)

38x 10³V , 2N/C

c)

28x10³V , 4N/C

d)

18x10³V , zero

27.

The electron volt (eV) is a unit of _____.

a)

potential

b)

charge

c)

energy

28.

If the charge on an metal sphere is doubled, the electric potential inside the sphere is ____.

a)

doubled

b)

quadrupled

c)

remains the same

29.

On an equipotential surface, the charges are_____.

a)

moving

b)

stationary

c)

none of these

30.

The earth can receive as well as give out quite a number of _____.

a)

protons

b)

electrons

c)

neutrons

31.

The radius of an equipotential surface of 300V surrounding a point charge of +1.5µC is

a)

45m

b)

450m

c)

4.5m

32.

The amount of work done in moving a charge of +5µC from one point to another on an equipotential surface of 10⁴ V is ____.

a)

5x10^-2J

b)

5x10⁴J

c)

zero

33.

The electric potential at infinite distance from a point charge is _____.

a)

zero

b)

infinity

c)

none of these

34.

The electric lines of force are _____ to the equipotential surfaces.

a)

parallel

b)

perpendicular

c)

none of these

35.

(1) Electric potential difference is measured in_____ .

a)

ampere

b)

watt

c)

volt

36.

Two spheres A and B of radius ‘a’ and ‘b’ respectively are at same electric potential. The ratio of the surface charge densities of A and B is

a)

$\frac{a^2}{b^2}$

b)

$\frac{b^2}{a^2}$

c)

$\frac{a}{b}$

d)

$\frac{b}{a}$

37.

The radius of a soap bubble whose potential is 16V is doubled. The new potential of the bubble will be

a)

8V

b)

2V

c)

4V

d)

16V

38.

When a proton is accelerated through 1V, then its kinetic energy will be

a)

1.6eV

b)

13.6eV

c)

1eV

d)

0.54eV

39.

How much kinetic energy will be gained by an $\alpha$ particle in going from a point at 70 V to another point at 50 V

a)

40eV

b)

40KeV

c)

40MeV

d)

0eV

40.

Equal charges are given to two spheres of different radii. The potential will

a)

Depend on the nature of the materials of the spheres

b)

Be more on the bigger sphere

c)

Be equal on both the spheres

d)

Be more on the smaller sphere

41.

A charge of 5 C experiences a force of 5000 N when it is kept in a uniform electric field. What is the potential difference between two points separated by a distance of 1cm

a)

10 V

b)

250 V

c)

1000 V

d)

2500 V

42.

Two charge +Q and -Q are situated at a certain distance. At the point exactly midway between them

a)

Electric field and potential both are zero

b)

Electric field is zero but potential is not zero

c)

Electric field is not zero but potential is zero

d)

Neither electric field nor potential is zero

43.

Two plates are 2cm apart, a potential difference of 10 V is applied between them, the electric field between the plates is

a)

20 N/C

b)

500 N/C

c)

5 N/C

d)

250 N/C

44.

Three charges 2q, -q, -q are located at the vertices of an equilateral triangle. At the centre of the triangle

a)

The field is zero but potential is non-zero

b)

Both field and potential are zero

c)

Both field and potential are non-zero

d)

The field is non-zero but potential is zero

45.

If a unit positive charge is taken from one point to another over an equipotential surface, then

a)

Work is done on the charge

b)

Work is done by the charge

c)

Work done is constant

d)

No work is done

46.

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of the sphere is

a)

0 V

b)

10 V

c)

Same as at point 5 cm away from the surface

d)

Same as at point 25 cm away from the surface

47.

Inside a hollow charged spherical conductor, the potential

a)

Varies directly as the distance from the centre

b)

Varies inversely as the distance from the centre

c)

Varies inversely as the square of the distance from the centre

d)

Is constant

48.

Two charged spheres of radii 10 cm and 15 cm are connected by a thin wire. No current will flow, if they have

a)

The same charge on each

b)

The same energy

c)

The same potential

d)

The same field on their surfaces

49.

It is a property of the object experiencing the electrical field.

a)

Electric Charge

b)

Energy

c)

Electricity

50.

The direction of electric field lines shows the

a)

direction of the force on a test positive charge.

b)

size of the field.

c)

strength of the field.

d)

all of the above

51.

Every proton in the universe is surrounded by its own

a)

gravitational field

b)

electric field

c)

both gravitational and electric field

d)

none of the above

52.

Electrostatic potential energy is recorded in units of electron-Volts (eV). What is equivalent to 1 eV?

a)

1.602×10⁻¹⁹ 𝐽

b)

100 𝐽

c)

220 𝐽

d)

0.003 𝐽

53.

The potential difference between the terminals of a connection wire is ……..

a)

Zero

b)

greater than zero

c)

Less than zero

d)

infinity

54.

The difference in electrical potential energy between two places is called …………...

a)

resistance

b)

friction

c)

induction

d)

voltage

55.

Electrostatic potential energy is recorded in units of electron-Volts (eV). What is equivalent to 1 eV?

a)

1.602×10⁻¹⁹ 𝐽

b)

100 𝐽

c)

220 𝐽

d)

0.003 𝐽

Electric potential

Total questions: 55

Worksheet time: 33mins

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