1. Consider the following statements regarding series grouping of capacitors and select the correct statements. I. Charge on each capacitor remains same and equals to the main charge supplied by the battery. II. Potential difference and energy distributes in the reverse ratio of capacitance. III. Effective capacitance is even les than the least of teh individual capacitances. ?

I and III

I, II and III

I and II

II and III

Answer: I, II and III

Explanation:


2. Which of the following quantities do not depend on the choice of zero potential or zero potential energy ?

Potential energy of a two-charge system

Potential at a point

Potential difference between two points

None of these

Answer: Potential difference between two points

Explanation:

Potential between the two points doesn't depend on the choice of zero potential. Thus, we conclude that potential difference between two points and change in potential energy of a two-charge system don't depend on the choice of zero potential point.


3. A parallel plate condenser is immersed in an oil of dielectric constant 2. The field between the plates is ?

decreased, proportional to 1/2

increased, proportional to root 2

increased, proportional to 2

decreased, proportional to 1/root2

Answer: decreased, proportional to 1/2

Explanation:

Emedium=Eair/K=E/2


4. On moving a charge of Q coulomb by X cm, W J of work is done, then the potential difference between the points is ?

Q2 /W V

QW V

W/Q *V

Q/W V

Answer: W/Q *V

Explanation:

On moving a charge of Q coulomb by X cm, W J of work is done, then the potential difference between the points is W/Q *V.


5. A positively charged particle is released from rest in an uniform electric field. The electric potential energy of the charge ?

decreases because the charge moves opposite to the electric field

increases because the charge moves along the electric field

remains a constant because the electric field is uniform

decreases because the charge moves along the electric field

Answer: decreases because the charge moves along the electric field

Explanation:

Equipotential surface is always perpendicular to the direction of electric field. Positive charge experiences the force in the direction of electric field. When a positive charge is released from rest in uniform electric field, its velocity increases in the direction of electric field. So K.E. increases, and the P.E. decreases due to law of conservation of energy. So P.E. of positively charged particle decreases because speed of charged particle moves in the direction of field due to force q E


6. 64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the small drop is q, then the charge on the big drop will be ?

16q

64q

4q

2q

Answer: 64q

Explanation:

By using Q = nq or Q = 64q


7. 64 drops each having the capacity C and potential V are combined to form a big drop. If the charge on the small drop is q, then the charge on the big drop will be ?

16q

64q

4q

2q

Answer: 64q

Explanation:

By using Q = nq or Q = 64q


8. On decreasing the distance between the plates of a parallel plate capacitor, its capacitance ?

increases

first increases then decreases

decreases

remains unaffected

Answer: increases

Explanation:

To reduce the capacitance of parallel plate capacitor, the space between the plate is. So increasing area and decreasing distance between plates results in increases capacitances.


9. Which of the following statements is/are correct for equipotential surface ? I. The potential at all the points on an equipotential surface is same. II. Equipotential surfaces never intersect each other. III. Work done in moving a charge from one point to other on an equipotential surface is zero. ?

I only

II only

I and II

I, II and III

Answer: I, II and III

Explanation:


10. Which of the following statements is/are correct for equipotential surface ? I. The potential at all the points on an equipotential surface is same. II. Equipotential surfaces never intersect each other. III. Work done in moving a charge from one point to other on an equipotential surface is zero. ?

I only

II only

I and II

I, II and III

Answer: I, II and III

Explanation: