Which of the following cannot be charged by friction, if held by hand?
A. a plastic scale
B. a copper rod
C. an inflated balloon
D. a woollen cloth
Answers
Answer:
a copper rod because it is a good conductor of electricity and heat.
Explanation:
electrification takes place in copper but spread to the other parts of the metal thus static electricity doesn't takes place.
through friction, charging occurs. but static electricity doesn't.
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B. a copper rod
Explanation:
Charging by friction involves rubbing two different materials together that have different pulls towards electrons, so that one material will pull away electrons when the materials are separated and both will become charged. Copper is a good conductor, so as soon as it gets charged by rubbing with another material, the electric charge produced on its surface will flow through our hand & body into the earth and it remains uncharged.
Option B is the answer