q (electron) = -1.6 x 10-19 C ; m(electron) = 9.11 x 10-31 kg q (proton) = +1.6

Question

q (electron) = -1.6 x 10-19 C ; m(electron) = 9.11 x 10-31 kg
q (proton) = +1.6 x 10-19 C ; m(proton) = 1.67 x 10-27 kg ; ke = 9.0x10-9 N.m2/C2
1. The tip of a plastic rod carries a negative charge. It is brought near an initially neutral pith ball. The electrostatic induction causes the closer end of the pith ball to get a positive charge and the farther end a negative charge. Which of the charges is called free charge?
(A) The negative charge on the plastic rod
(B) The positive charge on the pith ball
(C) The negative charge on the pith ball
(D) All of these
(E) None of these

Explanation / Answer

the answer is C) because the negative charges of pith ball are not bound to anything unlike the positve charges of pithball which are bounded to negative charges of plastic tip.

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