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Electrostatic Potential and Capacitance · Question 68

AIPMT 2004MCQEasy📈 Topic in 0% papers+4−1
1

An electric dipole has the magnitude of its charge as q and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively

  1. 2q.E and minimum
  2. q.E and p.E
  3. zero and minimum
  4. q.E and maximum

Answer

(3) zero and minimum

Solution

In a uniform field the forces +qE and -qE on the two charges are equal and opposite.

Net force = 0

Potential energy: U = -pE ; with p along E, = 0

U = -pE, the minimum value (stable equilibrium)

Answer: (3)

AIPMT 2004

Keep practising — Electrostatic Potential and Capacitance

2

Three capacitors each of capacity 4 are to be connected in such a way that the effective capacitance is 6 . This can be done by

  1. connecting all of them in series
  2. connecting them in parallel
  3. connecting two in series and one in parallel
  4. connecting two in parallel and one in series
AIPMT 2003
3

Identical charges (-q) are placed at each corner of a cube of side b then electrostatic potential energy of charge (+q) which is placed at centre of cube will be

  1. -4 2q2 0 b
  2. -8 2q2 0 b
  3. -4q2 3 0 b
  4. 8 2q24 0 b
AIPMT 2002
4

Some charge is being given to a conductor. Then its potential is

  1. maximum at surface
  2. maximum at centre
  3. remains same throughout the conductor
  4. maximum somewhere between surface and centre.
AIPMT 2002
5

A capacitor of capacity C1 charged up to V volt and then connected to an uncharged capacitor of capacity C2. The final potential difference across each will be

  1. C1VC1+C2
  2. C2VC1+C2
  3. (1- C2C1 )V
  4. (1+ C2C1 )V
AIPMT 2002
6

Energy per unit volume for a capacitor having area A and separation d kept at potential difference V is given by

  1. 12 0 V2d2
  2. 12 0 V2d2
  3. 12CV2
  4. Q22C
AIPMT 2001
7

A capacitor is charged with a battery and energy stored is U. After disconnecting battery another capacitor of same capacity is connected in parallel to the first capacitor. Then energy stored in each capacitor is

  1. U/2
  2. U/4
  3. 4U
  4. 2U
AIPMT 2000

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