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प्रश्न
An electric dipole of moment `vec"p"` is placed normal to the lines of force of electric intensity `vec"E"`, then the work done in deflecting it through an angle of 180° is:
पर्याय
pE
+2pE
−2pE
zero
MCQ
उत्तर
zero
Explanation:
W = PE(cos 90° − cos 270°) = 0
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