Question

Four charges are placed at the corners of a square of side 'a' in the figure. Find out the net force on the charge at the corners C

Answer 1

Answer:

Forces of repulsion on 1μC charge at O due to 3μC charge, at A and C are equal and opposite. So they cancel each other.

Similarly, forces of attraction of 1μC charge at O due to −4μC charges at B and D are also equal and opposite. So they also cancel each other.

Hence the net force on the charge of 1μC at O is zero