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) π*a*(R2-r2) c) a*(R-r) d) π*a* R2

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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) π*a*(R2-r2)

c) a*(R-r)

d) π*a* R2

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