3. a) Two wires, A and B, are made of the same metal and have equai length, but the resistance of wire A is four times the resis- tance of wire B. How do their diameters compare? b) A wire of resistance R is stretched uniformly (keeping its volume constant) until it is twice its original length. What happens to the resistance?
3. a) Two wires, A and B, are made of the same metal and have equai length, but the resistance of wire A is four times the resis- tance of wire B. How do their diameters compare? b) A wire of resistance R is stretched uniformly (keeping its volume constant) until it is twice its original length. What happens to the resistance?
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Transcribed Image Text:3.
a) Two wires, A and B, are made of the same metal and
have equai length, but the resistance of wire A is four times the resis-
tance of wire B. How do their diameters compare?
b) A wire of resistance R is stretched uniformly (keeping its volume
constant) until it is twice its original length. What happens to the
resistance?
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