A charge q is placed at the centre of the line joining two equal charges  The system of the three charges will be in equilibrium, if pis equal to: [1]
A. –\(\frac{Q}{2}\)
B. –\(\frac{Q}{4}\)
C. +\(\frac{Q}{4}\)
D. +\(\frac{Q}{2}\)
Answer:B
A charge q is placed at the centre of the line joining two equal charges  The system of the three charges will be in equilibrium, if pis equal to: [1]
A. –\(\frac{Q}{2}\) B. –\(\frac{Q}{4}\) C. +\(\frac{Q}{4}\) D. +\(\frac{Q}{2}\)