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Q.

Two charges +3.2×10−19C and −3.2×10−9C kept 2.4 Ao apart forms a dipole. If it is kept in uniform electric field of intensity 4×105volt​/​m then what will be its electrical energy in equilibrium

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a

+3×10−23 J

b

−3×10−23 J

c

−6×10−23 J

d

−2×10−23 J

answer is B.

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Detailed Solution

Potential energy of electric dipoleU=−pEcos⁡θ=−(q×2l)Ecos⁡θU=−3.2×10−19×2.4×10−104×105cos⁡θU=−3×10−23  (approx.)
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