A circular annulus of inner radius r and outer radius R has a uniform – McqOptions

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1.	A circular annulus of inner radius r and outer radius R has a uniform charge density a. What will be the total charge on the annulus?
A.	a*(R2-r2)
B.	πa(R2-r2)
C.	a*(R-r)
D.	πa R2
Answer» C. a*(R-r)

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