Question

Four charges +10 nC, - 20 nC, +10 nC and -20 nC respectively are placed at the corner
A, B, C and D of a square ABCD of side 1 m Calculate the resultant electric field at the centre of the square
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Answer 1

Answer:

zero !!

Explanation:

the reason being the contributions of the charges cancel out each other, and thus net field becomes zero(assuming like charges are placed at opposite ends of the diagonals of square, because the figure is missing)

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Answer 2

Answer:

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