A Thin Glass Rod Is Bent into a Semicircle of Radius

question 10

Multiple Choice

A thin glass rod is bent into a semicircle of radius R.A charge + Q is uniformly distributed along the upper half,and a charge -Q is uniformly distributed along the lower half,as shown in the figure.If R = 10 cm and the electric field E at point P is 4.81 * 10⁴ N/C in -y direction,what is the charge,Q? Point P is at the center of the semicircle.

• A)62 nC
• B)10 nC
• C)42 nC
• D)27 nC
• E)51 nC

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