Charge Q is uniformly distributed along a thin, flexible rod of length L. The rod is then bent into the semi circle shown in the figure (Figure 1)

Question

Question

Evaluate the field strength if L=18 cm and Q=38 nC.

Answer 1

Answer #1

Consider a small element with small charge dq

where R is the radial distance from the center point

From the circumference of the semicircle,

Equation becomes

Answer 2

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