Positive charge Q is distributed uniformly along the positive y-axis between y=0 and y=a. A negative point charge -q lies on the positive x-axis, a distance x from the origin as shown in the figure below. What is dEy? (The choices is on the second picture)

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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.