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Q.

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 field of 1.0×105  N/C the maximum torque on the dipole is:

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a

0.2X10−3N−m

b

2.0X10−3N−m

c

4.0X10−3N−m

d

1.0X10−3N−m

answer is B.

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Detailed Solution

τmax=pEsin⁡90=pE=q(2l)E=1×10−6×2×10−2×105=2×10−3N−m

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