An electric dipole, consisting of two opposite charges of 2 x 10-6 C each separated by a distance of 3 cm is placed in an electric field of 2 x 105 newton per coulomb. The maximum torque on the dipole will be

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12x 10-1 newton x metre

12 x 10-3 newton x metre

24 x 10-1 newton x metre

2ax 10-3 newton x metre

answer is B.

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Detailed Solution

τ=p×E Maximum torque τ=pE Here p=2×10−6C×(0.03m) =6×10−8Cm ∴ Maximum torque =6×10−82×105=12×10−3Nm

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