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    				| 1. | 
                                    Three charged particles having charges q, -2q & q are placed in a line at points (-a,0), (0,0), (a,0) respectively.The expression for electric potential at P(r,0) for r>>a is | 
                            
| Answer» Three charged particles having charges q, -2q & q are placed in a line at points (-a,0), (0,0), (a,0) respectively.The expression for electric potential at P(r,0) for r>>a is | |