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*(R<sup>2</sup>-r<sup>2</sup>)
B.	a(R<sup>2</sup>-r<sup>2</sup>)
C.	a*(R-r)
D.	a R<sup>2</sup>
Answer» C. a*(R-r)

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