A charge ‘q’is placed at the centre of the line joining two equal charges Q.The system of 3 charges will be in equilibrium, if ‘q’is equal to;
a)-Q/2
b)-Q/4
c) Q/2
d) Q/4
Asked Fayas Babu K
The answer is (b) – Q / 4
For the three charges to be in equilibrium, the net force must be zero. i.e, considering the net force on any one of Q (since q will be in equilibrium for any value of q when placed at the midpoint)
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