Four point charges as , + 4 microcoulomb, + 2 microcoulomb , - 4 microcoulomb and - 2 microcoulomb are respectively placed at the corners A ,B,C and D of a square of side length 10 cm . What is the electric field intensity at the centre of the square ?

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Solution

Answer will not be zero as Electric field due to diagonal charges +4 and -4 are in same direction. Same goes with +2 and -2 charges. now add them vectorially.

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