A piece of wire has a resistance R. It is cut into two pieces of equal...

Question

Question

A piece of wire has a resistance R. It is cut into two pieces of equal length, and the pieces are twisted together parallel to each other.

Part A What is the ratio of the resistance of the resulting wire to R?

Answer 1

Answer #1

the resistance of the resulting wire = (R/2 * R/2)/(R/2 + R/2)

= R/4

=> the ratio of the resistance of the resulting wire to R = (R/4)/R

= 1/4

Answer 2

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