Question

A spherical shell of radius r is given charge 3q on its surface and a point charge q is placed at distance r/2 from its centre
c. Also there is a charge 2q placed outside the shell at a distance of 2r as shown.

Answer 1

Answer:

hloo mate..

here's ur answer..

The magnitude of electric field at the centre C

C

due to charge on the outer surface of shell is

K q

2

R 2

Kq2R2

before closing the switch

S

S

The electric potential at the centre C

C

due to charges on the outer surface of shell is

(

−Kq

R

)

(-KqR)

before closing the switch

S

S

The electric potential at the centre C

C

due to charges on the outer surface of shell is

(

−Kq

R

)

(-KqR)

after closing the switch S

S

.

Charge flown through the switch in to earth after closing the switch S

S

is 5q

5q