Two non-conducting solid spheres of radii R and 2R, having uniform volume charge densities ρ 1 and ρ 2 respectively, touch each other. The net electric field at a distance 2R from the centre of the smaller sphere, along the line joining the centers of the spheres, is zero. The ratio 
can be
A
–4
B
- 
C
D
4
Text Solution
Verified by ExpertsThe correct answer is:
C
At point P
If resultant electric field is zero
then
= 4
At point Q
If resultant electric field is zero
then
= – 
(ρ 1 must be negative)
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