alleryStart learning →A dipole of charges 2 microcoulomb and length 2 cm is at 30 degrees in a 10^5 N/C field. The torque is
A4 x 10^-3 N m
B2 x 10^-3 N m
C1 x 10^-3 N m
D2 x 10^-2 N m
Answer & Solution
Correct answer: B. 2 x 10^-3 N m
p = 2 x 10^-6 x 0.02 = 4 x 10^-8 C m, and torque = p E sin 30 = 4 x 10^-8 x 10^5 x 0.5 = 2 x 10^-3 N m.
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