1.12 Dipole in a Uniform External Field

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Conceptual

1. A dipole is placed in a uniform electric field. Choose all the correct options.

1 point

The torque on it is zero when angle between p and E is zero

The torque on it is zero in two situations

The torque on the dipole is never zero

The dipole will experience a net force too.

2. A dipole is placed in a non-uniform electric field. It is possible that dipole experiences both torque and force.

1 point

False

True

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3. An electric dipole is placed in a uniform electric field

1 point

The maximum work that an external agent can do on it is -pE cos (theta)

The maximum work that an external agent can do on it is 2pE

The maximum work that an external agent can do is in taking it from theta = 0 to theta = 180

The maximum work that an external agent can do is in taking it from theta = 90 to theta = 270

4. An electric dipole is placed in a uniform electric field

1 point

Its potential energy is maximum at theta = 90, and is 0

Its potential energy is minimum at theta = 0 and is -PE

Its potential energy is maximum at theta = 180 and is pE

Torque on it is maximum at theta = 90, and is pE

Torque on it is maximum at theta = 180, and is 2pE

5. For an electric dipole kept in uniform electric field

1 point

theta = 0 is a position of equilibrium, and the equilibrium is stable

theta = 0 is a position of equilibrium, and the equilibrium is unstable

theta = 180 is a position of equilibrium, and the equilibrium is stable

theta = 180 is a position of equilibrium, and the equilibrium is unstable

6. An electric dipole of moment p is placed normal to the lines of force of electric intensity E, then the work done in deflecting it through an angle of 180 degrees is

1 point

2pE

-2pE

zero

Clear selection

7. Two charges +3.2x10^-19 and -3.2x10^-19 kept 2.4 Å apart forms a dipole. If it is kept in uniform electric field of intensity 4x10^5 v/m then what can be its possible electrical energy in equilibrium

1 point

+3x10^-23 J in unstable equilibrium

-3x10^-23 J in stable equilibrium

+3x10^-23 J in stable equilibrium

-3x10^-23 J in unstable equilibrium

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