Consider three infinite line charges with charged densities λ, -2 λ, 3 λ placed at y = d, 0, -d respectively. What is the net electric field at the point y = d/2? Set the upwards direction as the positive direction.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.