A metallic sphere has a charge of \( 10 \mu \mathrm{C} \). A unit negative eharge is brought fro...

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A metallic sphere has a charge of \( 10 \mu \mathrm{C} \). A unit negative eharge is brought from \( A \) to \( B \) both \( 100 \mathrm{~cm} \) away from the sphere but \( A \) being east of it while \( B \) being on west. The net work done is
(A) 7etro
(B) \( 2 / 10 \) joule
(C) \( -2 / 10 \) joule
(D) -1/10 joule
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