Two rods A and B of lengths L and L/2, respectively, are arranged as shown in the diagram below where d = L/2. Here, L = 2.40 m and the charge on rod A is 30.5 µC. If the net electric field at the midpoint between the two rods is zero, what is the charge (magnitude and sign) on rod B? The field at a distance y on the perpendicular bisector of a rod of length L is given by Erod = 2kq/y(L2 + 4y2) 1/2. <-- y times the square root of (L 2 + 4y2 ).

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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.