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An electric dipole, consisting of two opposite charges of 2 × 10–6 C each separated by a distance 3 cm is placed in an electric field of 2 × 105 N/C. Torque acting on the dipole is
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- 12 × 10–1 Nm
- 12 × 10–2 Nm
- 12 × 10–3 Nm
- 12 × 10–4 Nm
Correct Option: C
Charges (q) = 2 × 10–6 C, Distance (d) = 3 cm = 3 × 10–2 m and electric field (E) = 2 × 105 N/C.
Torque (τ) = q.d.
E = (2 × 10–6) × (3 × 10–2) × (2 × 105)
= 12 × 10–3 N–m .
