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Q.

Dipole is placed parallel to the electric field. If W is the work done in rotating the dipole by 60°, then work done in rotating it by 180° from the initial position of parallel to electric field is:

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a

3W

b

2W

c

4W

d

W/2

answer is C.

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Detailed Solution

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W=pEcos⁡0∘−cos⁡60∘=pE1−12=pE2W′=pEcos⁡0∘−cos⁡180∘=pE(1+1)=2pE=2(2w)=4w

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Dipole is placed parallel to the electric field. If W is the work done in rotating the dipole by 60°, then work done in rotating it by 180° from the initial position of parallel to electric field is: