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Electrostatic Potential and Capacitance Class 12 MCQs Questions with Answers
Solve this Electrostatic Potential and Capacitance Multiple Choice Questions of Class 12 Physics Chapter 2 MCQ, so as not to miss out on any concept from being clear about what they mean!
Multiple Choice Questions
Question 1.
A positively charged particle is released from rest in a uniform electric field. The electric potential energy of the charge
(a) remains a constant because the electric field is uniform.
(b) increases because the charge moves along the electric field.
(c) decreases because the charge moves along the electric field.
(d) decreases because the charge moves opposite to the electric field.
Answer
Answer: (c) decreases because the charge moves along the electric field.
Question 2.
The figure below shows some equipotential lines distributed in space. A charged object is moved from point A to point B.
(a) The work done in figure (i) is the greatest.
(b) The work done in figure (ii) is least.
(c) The work done is the same in figure (i), figure (ii) and figure (iii).
(d) The work done in figure (iii) is greater than figure (ii) but equal to that in figure (i).
Answer
Answer: (c) The work done is the same in figure (i), figure (ii) and figure (iii).
Question 3.
The electrostatic potential on the surface of a charged conducting sphere is 100 V. Two statements are made in this regard:
S1: At any point inside the sphere, electric intensity is zero.
S2: At any point inside the sphere, the electrostatic potential is 100 V. Which of the following is a correct statement?
(a) S1 is true but S2 is false.
(b) Both S1 and S2 are false.
(c) S1 is true, S2 is also true and S1 is the cause of S2.
(d) S1 is true, S2 is also true but the statements are independent.
Answer
Answer: (c) S1 is true, S2 is also true and S1 is the cause of S2.
Question 4.
A parallel plate capacitor is made of two dielectric blocks in series. One of the blocks has thickness d1 and dielectric constant k1 and the other has thickness d2 and dielectric constant k2 as shown in figure. This arrangement can be thought as a dielectric slab of thickness d (= d1 + d2) and effective dielectric constant k. The k is
(a) \(\frac { k_1d_1+k_2d_2 }{k_1+d_2}\)
(b) \(\frac { k_1d_1+k_2d_2 }{k_1-d_2}\)
(c) \(\frac { k_1d_2(d_2+d_2) }{(k_1d_1+k_2d_2)}\)
(d) \(\frac { 2k_1k_2}{k_1+k_2}\)
Answer
Answer: (c) \(\frac { k_1d_2(d_2+d_2) }{(k_1d_1+k_2d_2)}\)
Question 5.
Consider a uniform electric field in the z direction. The potential is not a constant
(a) in all space.
(b) for any x for a given z.
(c) for any y for a given z.
(d) on the x-y plane for a given z.
Answer
Answer: (a) in all space.
Question 6.
For equipotential surfaces, which statement is not correct?
(a) are closer in regions of large electric fields compared to regions of lower electric fields.
(b) will always be equally spaced.
(c) will be more crowded near sharp edges of a conductor.
(d) will be more crowded near regions of large charge densities.
Answer
Answer: (b) will always be equally spaced.
Question 7.
In a region of constant potential
(a) the electric field is uniform
(b) the electric field is zero
(c) there can be charge inside the region.
(d) the electric field shall necessarily change if a charge is placed outside the region.
Answer
Answer: (b) the electric field is zero
Question 8.
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 inside itself.
(b) there will be some charge in the body of the conductor.
(c) there must be charges only on the surface.
(d) there must be charges inside the surface.
Answer
Answer: (a) there must be charges on the surface or inside itself.
Question 9.
In an isolated parallel plate capacitor of capacitance C, the four surfaces have charges Q1, Q2, Q3 and Q4 as shown. The potential difference between the plates is
(a) \(\frac { Q_1+Q_2+Q_3+Q_4}{2C}\)
(b) \(\frac { Q_2+Q_3}{2C}\)
(c) \(\frac { Q_2-Q_3 }{2C}\)
(d) \(\frac { Q_1+Q_4}{2C}\)
Answer
Answer: (c) \(\frac { Q_2-Q_3 }{2C}\)
Question 10.
Three charges Q, +q and +q are placed at the vertices of a right-angled isosceles triangle as shown. The net electrostatic energy of the configuration is zero if Q is equal to
(a) \(\frac { -q}{1+√2}\)
(b) \(\frac { -√2q}{1+√2}\)
(c) -2q
(d) +q
Answer
Answer: (b) \(\frac { -√2q}{1+√2}\)
Fill in the Blanks
Question 1.
Electrostatic potential is ………….. throughout the volume of the conductor and has the same value (as inside) on its surface.
Answer
Answer: Constant
Question 2.
Electric field at the surface of a charged conductor is ……………
Answer
Answer: q/ε0
Question 3.
Capacitance of the earth depends upon its …………….
Answer
Answer: Radius
Question 4.
Capacitance of a capacitor does not depend upon the …………… and ………….. stored in it.
Answer
Answer: Potential, Charge
Question 5.
The capacitance of a parallel plate capacitor is ……………
Answer
Answer: ε0 A/d
Question 6.
When capacitors are connected in parallel, the net capacitance is the …………… of the individual capacitance.
Answer
Answer: sum
Question 7.
When capacitors are connected in series, the reciprocal of the net capacitance is the sum of the …………….. of the individual
capacitance.
Answer
Answer: reciprocal
Question 8.
The potential energy of a charge q placed at potential V is ………………
Answer
Answer: qV
Question 9.
It is safer to be inside the car rather than standing outside under a tree during lightning; this is based on ……………. concept.
Answer
Answer: Electrostatic shielding
Question 10.
Capacitor plates are charged by a battery. After charging, battery is disconnected and a dielectric slab is inserted between the plates; the charge on the plates of capacitor ……………….
Answer
Answer: Remains same
Question 11.
The amount of work done in bringing a charge q from infinity to a point un-accelerated is equal to ……………. acquired by the charge.
Answer
Answer: Electrostatic potential energy
Question 12.
A capacitor is charged and is not connected to a battery. Potential between plates of …………….. the capacitor when it is filled with dielectric.
Answer
Answer: Decreases
This NCERT MCQ Questions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance with Answers Pdf free download has been put together to help students understand the CBSE Class 12 Physics Electrostatic Potential and Capacitance MCQs Multiple Choice Questions with Answers. Hope you found this helpful!