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Q.

Two positive point charges of 12 μC and 8 μCare 10 cm apart. The work done in bringing them 6 cm closer is

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a

5.8 J

b

5.8 eV

c

13 J

d

13 eV

answer is C.

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Detailed Solution

W=Uf-Ui=9×109×Q1Q21r2-1r1 ⇒W=9×109×12×10-6×8×10-614×10-2-110×10-2 =12.96 J≈13 J
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