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Q.

Two positive point charges of 12μC and 8μC are 10cm apart. The work done in bringing them 4 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×Q1 Q21r2−1r1⇒W=9×109×12×10−6×8×10−614×10 −2−110 ×10 −2=12.96J≈13J
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