1.12 Dipole in a Uniform External Field
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
Clear selection
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
pE
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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