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What will be the amount of work done to ...

What will be the amount of work done to rotate an electric dipole of moment `2.0 xx 10^(-20)C cdot m` through an angle of `180^(@)` in an electric field of intensity `1.2 xx 10^(4) V cdot m^(-1)`?

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The correct Answer is:
`4.8 xx 10^(-16)J`
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