21.96 •• Two charges are placed as Figure P21.96 shown in Fig. P21.96. The magnitude of q1 is 3.00 puC, but its sign and the value of the charge q2 are not known. P 5.0 cm 12.0 cm The direction of the net electric field E É at point P is entirely in the negative y-direction. (a) Considering the different possible signs of q1 and q2, four possible diagrams could represent the electric fields Ej and E2 produced by q1 and q2. Sketch the four possible electric- field configurations. (b) Using the sketches from part (a) and the direction of E, deduce the signs of q1 and q2. (c) Determine the magnitude of E. 91 13.0 cm 92

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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.