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AP® Physics C: E & M

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Charge Density

APPHEM-ORL4WI

A balloon is blown up to a radius $R$. It is then has a positive charge $+Q$ added to it. Air is then let out so that the radius reduces to $R/2$, however, the net charge remains the same.

How is the charge density affected by the reducing of the radius?

A

The charge density increases.

B

The charge density is unaffected.

C

The charge density decreases.

D

The charge density exactly doubles.

E

The charge density is exactly half the original​.