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Q.

Electric dipole consists of two charges of magnitude 0.1μC separated by a distance of 2 cm. The dipole is in an external field of 105 N/C. What maximum torque does the field exert on the dipole?

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a

10−4N−m

b

2×10−8N−m

c

2×10−4N−m

d

3×10−4N−m

answer is C.

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Detailed Solution

qc=0.1μC=10−7C,2a=2cm=2×10−2mE=105N/C,τ=?As we know τ=P×Esin⁡θ, For maxτ,sin⁡θ=1τ=2×10−4N−m ∵sin⁡θmax=1
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