If a cat repeatedly rubs against your cotton slacks on adry day, the charge transfer between the cat hair and the cotton canleave you with an excess charge of -2.00 mC. (a) How many electronsare transferred between you and the cat?You will gradually discharge via the floor, but if instead ofwaiting, you immediately reach toward a faucet, a painful sparkcan suddenly appear as your fingers near the faucet. (b) In thatspark, do electrons flow from you to the faucet or vice versa?(c) Just before the spark appears, do you induce positive or negativecharge in the faucet? (d) If, instead, the cat reaches a pawtoward the faucet, which way do electrons flow in the resultingspark? (e) If you stroke a cat with a bare hand on a dry day, youshould take care not to bring your fingers near the cat’s nose oryou will hurt it with a spark. Considering that cat hair is an insulator,explain how the spark can appear.
If a cat repeatedly rubs against your cotton slacks on a
dry day, the charge transfer between the cat hair and the cotton can
leave you with an excess charge of -2.00 mC. (a) How many electrons
are transferred between you and the cat?
You will gradually discharge via the floor, but if instead of
waiting, you immediately reach toward a faucet, a painful spark
can suddenly appear as your fingers near the faucet. (b) In that
spark, do electrons flow from you to the faucet or vice versa?
(c) Just before the spark appears, do you induce positive or negative
charge in the faucet? (d) If, instead, the cat reaches a paw
toward the faucet, which way do electrons flow in the resulting
spark? (e) If you stroke a cat with a bare hand on a dry day, you
should take care not to bring your fingers near the cat’s nose or
you will hurt it with a spark. Considering that cat hair is an insulator,
explain how the spark can appear.
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