Electrostatics Question 420

Question: Two electric charges 12μC and 6μC are placed 20 cm apart in air. There will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero. The distance of P from 6μC charge is [EAMCET 2000]

Options:

A) 0.10 m

B) 0.15 m

C) 0.20 m

D) 0.25 m

Show Answer

Answer:

Correct Answer: C

Solution:

Point P will lie near the charge which is smaller in magnitude i.e. -6 m C.

Hence potential at P

V=14πε0(6×106)x+14πε0(12×106)(0.2+x)=0

therefore x = 0.2 m



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