Three charges q1 = 4.5 nC, q2 = -4.5 nC, and q3 = 1 nC are placed at three corners of a square (each side a = 20 cm) while another charge q4 = 2 nC is placed at the center as shown in figure. (a) What is the net Electric Field at the position of q4? Magnitude Direction = N/C degrees counterclockwise from +x axis (b) what is the net Electric Force on q4? Magnitude N degrees counterclockwise from +x axis Direction = (c) What is the electric potential at the location of q4? (d) What is the value (including sign) of charge that should be kept at the free corner of square (at point A), in order to have a zero net force on q4 ?

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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.