A charge of 8 mC is located at the origin. Calculate the work done by external agent in taking a small charge of –2 × 10 –9 C from a point A(0, 0, 0.03 m) to a point B(0, 0.04 m, 0) via a point C( 0, 0.06 m, 0.09 m).
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(W = Kqq 0 
= 1.2 J)
Sol. Work is path independent, so no use of point C.
∴ W = U B – U A
= q 
; where, r A & r B are positions of point A & B w.r.t origin.
r A = 0.03 m, r B = 0.04 m
= kq q 0 
= – 9 × 10 9 × 2 × 10 –9 × 8 × 10 –3 . 
= 1.2 J
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