Electrostatic Potential and Capacitance Class 12 Physics MCQs Pdf
21. Which of the following statement is 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
any point to infinity.
(c) Electrostatic force is non-conservative
(d) Potential is the productof charge and work.
Answer
Answer: a
22. 1 volt is equivalent to
Answer
Answer: c
23. 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
Answer
Answer: b
24. Consider a uniform electric field in the z-direction. The potential is a
constant
(a) for any x for a given z
(b) for any y for a given z
(c) on the x-y plane for a given z
(d) all of these
Answer
Answer: d
25. Equipotential surfaces
(a) are closer in regions of large electric fields compared to regions of lower
electric fields.
(b) will be more crowded near sharp edges of a conductor.
(c) will always be equally spaced.
(d) both (a) and (b) are correct.
Answer
Answer: d
26. In a region of constant potential
(a) the electric field is uniform.
(b) the electric field is zero.
(c) there can be no charge inside the region.
(d) both (b) and (c) are correct.
Answer
Answer: d
27. A test charge is moved from lower potential point to a higher potential point.
The potential energy of test charge will
(a) remain the same
(b) increase
(c) decrease
(d) become zero
Answer
Answer: c
28. An electric dipole of moment \(\vec{p}\) is placed in a uniform electric field
\(\vec{E}\) . Then
(i) the torque on the dipole is \(\vec{p} \times \overrightarrow{\mathrm{E}}\)
(ii) the potential energy of the system is \(\vec{p} .
\overrightarrow{\mathrm{E}}\)
(iii) the resultant force on the dipole is zero. Choose the correct option.
(a) (i), (ii) and (iii) are correct
(b) (i) and (iii) are correct and (ii) is wrong
(c) only (i) is correct
(d) (i) and (ii) are correct and (iii) is wrong
Answer
Answer: b
29. If a conductor has a potential V ≠ 0 and there are no charges anywhere else
outside, then
(a) there must be charges on the surface or in¬side itself.
(b) there cannot be any charge in the body of the conductor.
(c) there must be charges only on the surface.
(d) both (a) and (b) are correct.
Answer
Answer: c
30. Which of the following statements is false for a perfect conductor?
(a) The surface of the conductor is an equipoten-tial surface.
(b) The electric field just outside the surface of a conductor is perpendicular to
the surface.
(c) The charge carried by a conductor is always uniformly distributed over the
surface of the conductor.
(d) None of these.
Answer
Answer: d