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Consider three charges q_1,q_2,q_3 each equal to q at the vertices of an equilateral triangle of side l. what is the force on a charges Q ( with the same sign as q)placed at the centroid of the triangle,as shown in figure? |
| Answer» Solution : The forces `F_1 ,F_2 and F_3` are equal ( in magnitude) and act ALONG the MEDIANS with inclination `120^(@) ` each. They form a CLOSED VECTOR triangles and hence the resultant is zero. | |