Electric Potential Quiz - CBSE Class 12 Physics

Free practice quiz: Electric Potential (CBSE Class 12 Physics). 11 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Physics practice quiz has 11 multiple-choice questions on Electric Potential, and 11 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is electric potential at a point?

   1. The work done in moving a unit positive charge from infinity to that point.
   2. The force experienced by a unit positive charge at that point.
   3. The energy possessed by a unit positive charge at that point.
   4. The potential energy of a unit positive charge at that point.
   Show answer

   Answer: A. The work done in moving a unit positive charge from infinity to that point.

   Electric potential is defined as the work done per unit charge in bringing a positive test charge from infinity to that point.

2. A positive charge is moved from a point of higher potential to a point of lower potential. What happens to its potential energy?

   1. Increases
   2. Decreases
   3. Remains the same
   4. Becomes zero
   Show answer

   Answer: B. Decreases

   Potential energy of a positive charge decreases when it moves from higher to lower potential.

3. What is the unit of electric potential?

   1. Newton
   2. Coulomb
   3. Volt
   4. Joule
   Show answer

   Answer: C. Volt

   The unit of electric potential is the Volt (V).

4. Derive an expression for the electric potential due to a point charge q at a distance r from it.

   1. V = kq/r
   2. V = kq/r²
   3. V = kq²r
   4. V = kqr
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   Answer: A. V = kq/r

   The derivation involves calculating the work done in bringing a unit positive charge from infinity to a distance r from the point charge q using the definition of electric potential.

5. Three charges, +q, +q, and -2q are placed at the vertices of an equilateral triangle. What is the electric potential at the centroid of the triangle?

   1. Zero
   2. kq/a
   3. 2kq/a
   4. 3kq/a
   Show answer

   Answer: A. Zero

   Due to symmetry, the potential due to +q and +q cancels each other out. The potential at the centroid is thus zero.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Two points A and B are at distances r and 2r respectively from a point charge. What is the ratio of electric potential at A to that at B?
2. What is the electric potential at the center of a uniformly charged spherical shell?
3. A capacitor is charged to a potential difference V. If the distance between the plates is doubled while maintaining the same charge, what happens to the potential difference?
4. Explain the concept of equipotential surfaces.
5. A parallel plate capacitor with capacitance C is charged to a potential V and then disconnected from the battery. If the separation between the plates is increased to twice the initial separation, what is the new potential across the capacitor?
6. Consider a system of three charges, q1, q2, and q3, located at positions r1, r2, and r3 respectively. What is the total potential energy of the system?

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