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A dipole of moment 2 × 10^-8 C m lies across a 10^4 N/C field. Torque?
A2 × 10^-12 N m
B2 × 10^-4 N m
C2 × 10^4 N m
D2 × 10^-2 N m
Answer & Solution
Correct answer: B. 2 × 10^-4 N m
τ = pE sin 90 degrees = 2 × 10^-8 × 10^4 = 2 × 10^-4 N m.
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