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  4. Four charges are arranged at the corners of a square A B C D as shown in the figure. The force on the positive charge kept at the centre O is

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Q. Four charges are arranged at the corners of a square $A B C D$ as shown in the figure. The force on the positive charge kept at the centre $O$ isPhysics Question Image

Electric Charges and Fields

Solution:

Magnitude as well as polarities of charges at points $A$ and $C$ are same. Therefore forces at $O$, due to these charges cancel each other. Moreover, polarities of the charges at $B$ and $D$ are opposite; therefore force on charge kept at the centre is along the diagonal $B D$.