Charge Q is uniformly distributed along a thin, flexible rod of length L. The rod is then bent into the semicircle shown in the figure (Figure 1). Find an expression for the electric field E at the center of the semicircle. Hint: A small piece of arc length As spans a small angle Að = As /R, where R is the radius. Express your answer in terms of the variables Q, L, unit vectors i, j, and appropriate constants. Figure 1 of 1 ΑΣφ ? Center Part B Evaluate the field strength if = 12 cm and Q = 41 nC . Express your answer with the appropriate units. 回 =

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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.