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A test charge of + 4 µC is at a field-point P where the electric field E due to other
charges is directed to the right and has a magnitude |E| = 4 x 106 N/C. If the test
charge is replaced with a charge of - 4 µC, the electric field at P gets modified to E'
as :
O E' = E
O E = (3/4) E
O E' = (4/3) E
E' = - E

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