| Four point charges are placed at the corners of a square ABCD of side 10 cm, as shown in figure. The force on a charge of \[1\mu C\] placed at the centre of square is: |
|
A) 7N
B) 8N
C) 2N
D) zero
Correct Answer: D
Solution :
(d) zero Forces of repulsion on \[1\mu C\] charge at O due to \[3\mu C\] charges, at A and C are equal and opposite. So, they cancel each other. Similarly, forces of attraction of \[1\mu C\] charge at O due to\[-4\mu C\]charges at B and D are also equal and opposite. So they also cancel each other. Hence, the net force on the charge of \[1\mu C\] at O is zero.
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