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Question

Physics Question on Electric charges and fields

Four point charges are placed at the corners of a square ABCDABCD of side 10cm10\, cm, as shown in figure. The force on a charge of 1μC1\,\mu C placed at the centre of square is

A

7N7\,N

B

8N8\,N

C

2N2\,N

D

zero

Answer

zero

Explanation

Solution

Forces of repulsion on 1μC1\,\mu C charge at OO due to 3μC3\,\mu C charge, at AA and CC are equal and opposite. So they cancel each other. Similarly, forces of attraction of 1μC1\,\mu C charge at OO due 4μC-4\,\mu C charges at BB and DD are also equal and opposite. So they also cancel each other. Hence the net force on the charge of 1μC1\,\mu C at OO is zero.