# A spherical shell of radius R = 1.5cm has a charge q = 20μC uniformly distributed over it. The force exerted….

Q.A spherical shell of radius R = 1.5cm has a charge q = 20μC uniformly distributed over it. The force exerted by one half over the other half is

(a) zero

(b) 10-2 N

(c) 500 N

(d) 2000 N

Sol: E= σ/2ℇ0 , Pressure P = σ2/2ℇ0

Force F = P × πR2

= σ2/2ℇ0 × πR2

= (q /4 πR2 )2 πR2/2ℇ0

Putting the given value

Ans: (d)