Electric Potential and Potential Difference

Physics ⇒ Electricity and Magnetism

Electric Potential and Potential Difference starts at 10 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Electric Potential and Potential Difference. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.

See sample questions for grade 12

12~\text{V}

battery is connected to a lamp. If

120~\text{C}

of charge flows through the lamp, how much energy is supplied by the battery?

5~\text{V}

battery is connected across a resistor. How much energy is transferred when

3~\text{C}

of charge passes through the resistor?

A charge of

1~\mu\text{C}

is placed in an electric field. If the potential at its location is

1000~\text{V}

, what is its potential energy?

A charge of

4~\text{C}

is moved through a potential difference of

6~\text{V}

. Calculate the work done.

A point charge of

+2~\mu\text{C}

is placed at the origin. What is the electric potential at a point

0.5~\text{m}

away from the charge? (Take

k = 9 \times 10^{9}~\text{N} \cdot \text{m}^{2}/\text{C}^{2}

)

A proton is moved from point A to point B against an electric field. Does its electric potential energy increase or decrease?

A uniform electric field of

200~\text{N}/\text{C}

exists between two parallel plates separated by

0.02~\text{m}

. What is the potential difference between the plates?

Describe what happens to the electric potential as you move farther away from a positive point charge.

Describe what is meant by the term 'potential difference' between two points in an electric field.

Explain the significance of zero potential at infinity in the context of point charges.

Explain why the electric potential inside a hollow conducting sphere is constant and equal to its surface potential.

Explain why the potential difference between two points is independent of the path taken between them in an electrostatic field.

If 10 J of work is required to move 2 C of charge from point A to point B, what is the potential difference between A and B?

If the electric potential at a point is

20~\text{V}

, how much work is required to bring a charge of

0.5~\text{C}

from infinity to that point?

If the potential at point A is

12~\text{V}

and at point B is

5~\text{V}

, what is the potential difference

V_{AB}

State the relationship between electric field (E) and electric potential (V) in a uniform field.

A charge of

-5~\mu\text{C}

is moved from a point at

120~\text{V}

to a point at

80~\text{V}

. Calculate the work done by the electric field during this process.

A particle of charge

+2~\mu\text{C}

is moved from point X to point Y in a uniform electric field of strength

500~\text{N}/\text{C}

. The displacement from X to Y is

0.04~\text{m}

and is parallel to the field lines. Calculate the change in electric potential energy of the particle.

A proton is released from rest at a point where the electric potential is

150~\text{V}

. What is its speed after moving to a point where the potential is

50~\text{V}

? (Assume no other forces act and mass of proton

= 1.67 \times 10^{-27}~\text{kg}

, charge

= 1.6 \times 10^{-19}~\text{C}

)

Explain why the electric potential is continuous across the boundary of a charged conducting sphere, but the electric field is not.