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)