chapter-2-part-1-electrostatic potential

The work done in moving a unit positive test charge over a closed path in an electric field is _____________.

• Always 1

• Infinite

• Zero

• Negative

The electrostatic potential on the perpendicular bisector due to an electric dipole is _____________.

• Zero

• 1

• Infinite

• Negative

A surface that has the same electrostatic potential at every point on it is known as _____________.

• Equal-potential surface

• Same potential surface

• Equi-magnitude surface

• Equipotential surface

The work done against electrostatic force gets stored in which form of energy?

• Thermal energy

• Kinetic energy

• Potential energy

• Solar energy

Electric potential at any point x, y, z in the space is given V=4x²−3x

Find the electric field at any point (x, y, z)

• (8x - 3)i

• -(8x - 3)i

• -8xi

• 8xi

A test charge is moved from lower potential point to a higher potential point. The potential energy of test charge will

• remain the same

• increase

• decrease

• becomes zero

If a conductor has a potential V ≠ 0 and there are no charges anywhere else outside, then

• there must be charges on the surface or in¬side itself.

• there cannot be any charge in the body of the conductor.

• there must be charges only on the surface.

• both (a) and (b) are correct.

Which of the following statements is false for a perfect conductor?

• The surface of the conductor is an equipoten-tial surface.

• The electric field just outside the surface of a conductor is perpendicular to the surface.

• The charge carried by a conductor is always uniformly distributed over the surface of the conductor.

• None of these.

Equipotentials at a great distance from a collection of charges whose total sum is not zero are approximately

• spheres

• planes

• paraboloids

• ellipsoids

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

• 0 V

• 10 V

• Same as at point 5 cm away from the surface

• Same as at point 25 cm away from the surface