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AP® Physics 1 & 2

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Moderate

Charge Transfer: Conducting Spheres: Initial Charge

APPH12-GT2XQE

Sphere $A$ and Sphere $B$ are metal spheres of identical size and shape. They are set on insulating stands and each has a different initial charge. Spheres $A$ and $B$ come into contact. A spark between the spheres indicates that a charge is transferred. After contact, each sphere has a charge of negative 5 micro-coulombs.

If the charge on Sphere $A$ was positive 22 micro-coulombs before contact, what was the charge on Sphere $B$ before contact?

A

Positive 17 micro-coulombs.

B

Positive 11 micro-coulombs.

C

Negative 27 micro-coulombs.

D

Negative 32 micro-coulombs.