Question

Charges Q, 2Q and 4Q are uniformly distributed in three dielectric solid spheres 1, 2 and 3 of radii `R//2`, R and 2R respectively, as shown in figure. If magnitude of the electric fields at point P at a distance R from the centre of sphere 1,2 and 3 are `E_1, E_2 and E_3` respectively, then

A. `E_(1) gt E_(2) gt E_(3)`
B. `E_(3) gt E_(1) gt E_(2)`
C. `E_(2) gt E_(1) gt E_(3)`
D. `E_(3) gt E_(2) gt E_(1)`

Answer 1

Correct Answer - C
`E_(1)=(KQ)/R^(2)`
`E_(2)=(K(2Q))/R^(2)`
`E_(3)=(K(4Q))/((2R)^(3))xxR=(KQ)/(2R^(2))`
`E_(2) gt E_(1) gt E_(3)`