# Q: An electric dipole consists of two opposite charges, each of magnitude 1.0μC separated by a distance of 2.0 cm. The dipole is placed in an external electric field of 10^5 N/C. The maximum torque on the dipole is:

## Question:

An electric dipole consists of two opposite charges, each of magnitude 1.0μC separated by a distance of 2.0 cm. The dipole is placed in an external electric field of 10^5 N/C. The maximum torque on the dipole is:

## Options:

(A) point charge.

(B) Infinite uniform line charge

(C) uniformly charged infinite plane.

(D) uniformly charged spherical shell.

(C) uniformly charged infinite plane.

The uniformly charged infinite plane or parallel configuration produces a uniform electric field.

## Solution:

Given:

q (charges magnitude in Coulomb) = 10-6 C

d (Distance between charges in Meter) = 2  × 10-2 m.

E (electric field) = 105 N/C

Calculations:

p = q × d = 10-6 × (2  × 10-2)

= 2  × 10-8 Cm.

Τmax = pE = (2  × 10-8 )× 105

= 2  × 10-3 Nm

Here option (C) is correct which is 2 × 10-3 N-m.