Question

A conducting spherical shell having inner radius a and outer radius b carries a net charge q. If a point charge q is placed at the centre of this shell, then the surface charge density on the outer surface of the shell is 1) (3q)/(4pi * b ^ 2) 2) q/(4pi * b ^ 2) 4) Zero 3) 2q 4pi * b ^ 2​

Answer 1

Answer:

Correct option is C)

forceonBduetoA=f

1

=

a

2

kQ

2

forceonCduetoB=f

2

=

a

2

kQ

2

resultantofthesetwoforces=f=

f

1

2

+f

2

2

=

2

a

2

kQ

2

forceduetoD=f

3

=

2a

2

kQ

2

R=netforce=

f

2

+f

3

2

+2f

3

cos0

=f+f

3

=

2

a

2

kQ

2

+

2a

2

kQ

2

=

a

2

kQ

2

(

2

2

2

+1

).

Hence, the option C is the correct answer.

Solve any question of Electric Charges and