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 nonuniform 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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