Question

An electric dipole consisting of two opposite charges of $2 \times 10^{- 6}C$ each separated by a distance of $3cm$ is placed in an electric field of $2 \times 10^{5}$ N/C. The maximum torque on the dipole will be

• A. $12 \times 10^{- 1}Nm$
• B. $12 \times 10^{- 3}Nm$
• C. $24 \times 10^{- 1}Nm$
• D. $24 \times 10^{- 3}Nm$

Answer 1

Answer: (B)

$12 \times 10^{- 3}Nm$

Answer 2

Maximum torque = pE

= 2 × 10^–6 × 3 × 10^–2 × 2 × 10⁵ = 12 × 10^–3 N-m.