Electrostatics Question 409

Question: Two positive point charges of 12μC and 8μC are 10cm apart. The work done in bringing them 4 cm closer is [AMU 2000]

Options:

A) 5.8 J

B) 5.8 eV

C) 13 J

D) 13 eV

Show Answer

Answer:

Correct Answer: C

Solution:

W=UfUi=9×109×Q1Q2[1r21r1]

therefore W=9×109×12×106×8×106[14×102110×102] = 12.96 J » 13 J



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