Mock Test Physics

Which of the following statement is true?

• Electrostatic force is a conservative force.

• Potential at a point is the work done per unit charge in bringing a charge from any point to infinity.

• Electrostatic force is non-conservative

• Potential is the product of charge and work.

volt is equivalent to

The work done in bringing a unit positive charge from infinite distance to a point at distance x from a positive charge Q is W. Then the potential at that point is

Consider a uniform electric field in the z-direction. The potential is a constant

• for any x for a given z

• for any y for a given z

• on the x-y plane for a given z

• all of these

Equipotential surfaces

• are closer in regions of large electric fields compared to regions of lower electric fields.

• will be more crowded near sharp edges of a conductor.

• will always be equally spaced.

• both (a) and (b) are correct.

In a region of constant potential

• the electric field is uniform.

• the electric field is zero.

• there can be no charge inside the region.

• both (b) and (c) are correct.

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

• become zero

A electric dipole of moment p⃗ is placed in a uniform electric field E⃗ . Then

• the torque on the dipole is p⃗ ×E→

• the potential energy of the system is p⃗ .E→

• the resultant force on the dipole is zero. Choose the correct option.

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.