ElectrostaticsHard

Question

An electric dipole consists of two opposite charges each of magnitude 1.0 μC, separated by a distance of 2.0 cm. The dipole is placed in an external electric field of 1.0 × 105 N/C. The maximum torque on the dipole is :

Options

A.0.2 × 10-3 N-m
B.1.0 × 10-3 N-m
C.2.0 × 10-3 N-m
D.4.0 × 105 N-m

Solution

τmax = pE sin 90o = 10-6 × 2 × 10-2 × 1 × 105 N − m = 2 × 10-3  N-m

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