Charge Q is divided into two parts which are then kept some distance apart. The force between them will be maximum if the two parts are

Q.Charge Q is divided into two parts which are then kept some distance apart. The force between them will be maximum if the two parts are
(a) Q/2 and Q/2
(b) Q/2 and 3Q/4
(c) Q/2 and 2Q/3
(d) e and (Q-e)
Sol: (a)
Let charges are q, Q − q
F = k q(Q −q)/r2 = k(qQ − q^2)/r2
For F to be maximum
dF/dq = 0 ⇒ Q − 2q = 0 ⇒ q = Q/2
Charges are Q/2 , Q/2

Author: Rajesh Jha

QuantumStudy.com

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