Question

Electric dipole consists of two charges of magnitude 0.1 µC separated by a distance of 2 cm. The dipole is in 5 an external field of 10⁵ N/C. What maximum torque does the field exert on the dipole?

Options

• 10^-4N-M

• 2 × 10^-8 N-m

• 2 × 10^-4 N-m

• 3 × 10^-4 N-m

Answer 1

2 × 10^-4 N-m

Explanation:

q_c = 0.1 μc = 10^-7 C

2a = 2 cm = 2 × 10^-2 m

E = 10⁵ N/C, τ = ?

As we know : τ = ?           ..`[("For max" τ sin theta = 1),(because sin theta_"max" = 1)]`

τ = 2 × 10^-4 N-m