2. You rub a plastic rod with wool so that the rod has a negative charge. You br

Question

2. You rub a plastic rod with wool so that the rod has a negative charge. You bring the rod close to one end of a metal rod.

(a) Draw a charge diagram showing the charges on the plastic rod and metal rod while the plastic rod is near the end of the metal rod.

(b) Suppose the plastic rod is now touched to the metal rod and then taken away. Draw a charge diagram showing the arrangement of charges on the metal rod now.

(c) The plastic rod is given a negative charge again. It is touched to one end of second plastic rod and then taken away. Draw a charge diagram showing the configuration of the charges on the second plastic rod.

Explanation / Answer

a) Charges are uniformly distributed on the plastic rod as there is no electric field due to metal rod, which is for now neutral. b) When they are touched, metal rod gains some electrons. So metal rod and plastic rod, both are now negatively charged. Negative charge on metal rod gets uniformly distributed, and the plastic rod also has uniform charge distribution now. The part which was touched has lost the electrons but the repulsion between the electrons disperses the charge uniformly again. c) Charge doesn't get transferred to other plastic rod. and the first rod has uniform negative charge distribution. Other rod is electrically neutral.

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