Electrostatic induction with conducting balls · CAP 2004 #Q19

Physics · electromagnetism

Problem

Two uncharged balls A and B, each very light and coated with a conducting material, hang vertically side by side just touching each other. A positively-charged glass rod is brought near ball A without touching it. Now A and B are separated and then the glass rod is removed. If

Q_A

and

Q_B

represent the electric charges on A and B, respectively, you conclude that (a)

Q_A < 0

and

Q_B < 0

; (b)

Q_A < 0

and

Q_B > 0

; (c)

Q_A > 0

and

Q_B < 0

; (d)

Q_A > 0

and

Q_B > 0

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