Electrostatics Question 783

Question: Three charges -q, +q and +q are situated in X-Y plane at points (0, -a), (0, 0) and (0, a) respectively. The potential at a point distant r (r>a) in a direction making an angle θ from Y-axis will be

Options:

A) Kqr(12acosθr)

B) 2kqcosθr2

C) Kqr

D) Kqr(1+2acosθr)

Show Answer

Answer:

Correct Answer: D

Solution:

[d] V=Kq.2acosθr2+Kqr=Kqr[2acosθr+1]



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