Suppose ball A is stroked with a plastic rod that has been rubbed with fur. When
ID: 1549966 • Letter: S
Question
Suppose ball A is stroked with a plastic rod that has been rubbed with fur. When you observe interactions between pairs of balls one at a time you find that: 1. B, C, and D are each attracted to A. 2. B and C seem to have no effect on each other. 3. B and C are both attracted to D. What is the net charge on each of the balls? Which ones, if any, have positive charge? Negative charge? No charge at all? Explain your reasoning. Hint: Induction may be involved.
Consider four lightweight metal coated balls suspended on nonconducting threads as shown in the diagram that follows.Explanation / Answer
When a plastic rod is rubbed with a fur, negative charges are transferred from fur to the plastic rod. So the rod becomes negatively charged and the fur becomes positively charged. As B and C has no effect on each other they both must be neutral . So ball B and C are uncharged. As ball A is touched with negatively charged rod, the charge will transfer from plastic rod to the metal coated ball A and it will also become negatively charged. These charges will spread over the surface of metal ball A. If the pastic rod carry charge Q by bringing in contact with ball A it will transfer half of its charge to ball A.So total negative charge on ball A will be Q/2. As B and C are both attracted to D so D is positively charged.
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