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एक वैघृत द्विघ्रुव जिसका द्विघ्रुव आघूर्ण E है, एकसमान वैघृत क्षेत्र की दिशा में) रखा है| द्विघ्रुव को- (i) `90^(@)`, (ii) `180^(@)` कोण से घुमाने में कितना कार्य करना होगा?

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द्विघ्रुव को वैघृत क्षेत्र की दिशा से `theta` कोण घुमाने में किया गया कार्य,
`W=pE(1-costheta)`
(i) `theta=90^(@), therefore W=pE(1-cos90^(@))=pE(1-0)=pE`
(ii) `theta=180^(@), therefore W=pE(1-cos180^(@))=pE[1-(-1)]`
=2pE

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