CBSE Class 12 Physics Electric Potential And Capacitance Worksheet

Electric Potential And Capacitance MCQ Questions with Answers Class 12 Physics 

Question- An arrangement which consists of two conductors separated by a dielectric medium is called

(a) resistor

(b) inductor

(c) rectifier

(d) capacitor

Answer-(d)

Question- A charge is brought from a point on the equatorial plane of a dipole to its mid-point. Which of the following quantities remains constant ?

(a) Electric field

(b) Force on the charge brought.

(c) Torque exerted by the charge on dipole.

(d) Electric potential

Answer-(d)

Question- It becomes possible to define potential at a point in an electric field because electric field

(a) is a conservative field

(b) is a non-conservative field

(c) is a vector field

(d) obeys principle of superposition

Answer-(a)

Question-Capacitiors are used in electrical circuits where applicances need more

(a) voltage

(b) current

(c) resistance

(d) power

Answer-(b)

Question-The potential energy of a system of two charges is negative when

(a) both the charges are positive

(b) both the charges are negative

(c) one charge is positive and other is negative

(d) both the charges are separated by infinite distance

Answer-(c)

Question-An electric dipole is kept in non-uniform elecric field. it experiences

(a) a force and a torque

(b) a force but not a torque

(c) a torque but not a force

(d) Neither a force nor a torque

Answer-(a)

Question-Energy is stored in a capacitor in the form of

(a) electrostatic energy

(b) magnetic energy

(c) light energy

(d) heat energy

Answer-(a)

Question-A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. The potential at a distance of 2 cm from the centre of the sphere is

(a) zero

(b) 10 V

(c) 4 V

(d) 10/3 V

Answer-(b)

Question-A capacitor works in

(a) A. C. circuits

(b) D. C. circuits

(c) both (a) and (b)

(d) neither (a) nor (b)

Answer-(a)

Question-The electric potential inside a conducting sphere

(a) increases from centre to surface

(b) decreases from centre to surface

(c) remains constant from centre to surface

(d) is zero at every point inside

Answer-(c)

Question-In a charged capacitor, the energy is stored in

(a) the negative charges

(b) the positive charges

(c) the field between the plates

(d) both (a) and (b)

Answer-(c)

Question-On decreasing the distance between the plates of a parallel plate capacitor, its capacitance

(a) remains unaffected

(b) decreases

(c) first increases then decreases.

(d) increases

Answer-(d)

Question-Van de Graaff generator is used to

(a) store electrical energy

(b) build up high voltage of few million volts

(c) decelerate charged particle like electrons

(d) both (a) and (b)

Answer-(b)

Question-Which of the following about potential at a point due to a given point charge is true ?The potential at a point P due to a given point charge

(a) is a function of distance from the point charge.

(b) varies inversely as the square of distance from the point charge.

(c) is a vector quantity

(d) is directly proportional to the square of distance from the point charge

Answer-(a)

Question-A conductor carries a certain charge. When it is connected to another uncharged conductor of finite capacity, then the energy of the combined system is

(a) more than that of the first conductor

(b) less than that of the first conductor

(c) equal to that of the first conductor

(d) uncertain

Answer-(b)

Question-Capacity of a parallel plate condenser can be increased by

(a) increasing the distance between the plates

(b) increasing the thickness of the plates

(c) decreasing the thickness of the plates

(d) decreasing the distance between the plates

Answer-(d)

Question-Which of the following is / are true about the principle of Van de Graaff generator?

(a) The action of sharp points.

(b) The charge given to a hollow conductor is tranferred to outer surface and is distributed uniformly over it.

(c) It is used for accelerating uncharged particle.

(d) Both (a) and (b)

Answer-(d)

Question-In a region of constant potential

(a) the electric field is uniform

(b) the electric field is zero

(c) the electric field shall necessarily change if a charge is placed outside the region

(d) None of these

Answer-(b)

Question-If in a parallel plate capacitor, which is connected to a battery, we fill dielectrics in whole space of its plates, then which of the following increases?

(a) Q and V

(b) V and E

(c) E and C

(d) Q and C

Answer-(d)

Question-In a charged capacitor, the energy resides

(a) in the positive charges.

(b) in both the positive and negative charges.

(c) in the field between the plates.

(d) around the edges of the capacitor plates.

Answer-(c)

Question-The electric potential at a point on the equatorial line of an electric dipole is

(a) directly proportional to distance

(b) inversely proportional to distance

(c) inversely proportional to square of the distance

(d) None of these

Answer-(d)

CONCEPTUAL AND APPLICATION TYPE QUESTIONS

1 Can the electric potential at a point be zero , while the electric field is non zero? Justify

2 Can the electric field at a point be zero , while the electric potential is non zero? Justify.

3 Why work done in taking a charge between any two points of an equipotential surface?

4 Show that electric field is always perpendicular to an equipotential surface.

5 The capacitance of a charged capacitor is C and the energy stored in it is U . Write the expression for Q in terms of C and U.

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