Question

An electric dipole of dipole moment 5 × 10– 8 Cm experiences a torque of the magnitude 2.5 ×

10– 5 Nm when placed in a uniform electric field of 103 N/C. Find the angle between the dipole and

the electric field?​

Answer 1

Answer:

Electric dipole moment, E=4×10

−9

N/C

Angle made by p with a uniform electric field, θ = 30°

Electric field, E=5×10

4

N/C

Torque acting on the dipole:

τ=pEsinθ

=4×10

−9

×5×10

4

×sin30

o

=20×10

−5

×

2

1

=10

−4

Nm

Hence, the magnitude of the torque acting on the dipole is 10

−4

N m.