Four point charges are paced at the corners of a square $A B C D$ of side $10 c m$ , as shown in figure. The force on a charge of $1 μ C$ placed at the centre of square is;

7 N

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8 N

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2 N

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zero

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Solution

The correct option is A zero
Forces of repulsion on $1 μ C$ charge at $O$ due to $3 μ C$ charge, at $A$ and $C$ are equal and opposite. So they cancel each other.
Similarly, forces of attraction of $1 μ C$ charge at $O$ due to $- 4 μ C$ charges at $B$ and $D$ are also equal and opposite. So they also cancel each other.
Hence the net force on the charge of $1 μ C$ at $O$ is zero

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Four point charges are paced at the corners of a square ABCD of side 10cm, as shown in figure. The force on a charge of 1μC placed at the centre of square is;

Four point charges are paced at the corners of a square $A B C D$ of side $10 c m$ , as shown in figure. The force on a charge of $1 μ C$ placed at the centre of square is;