A) 225
B) 15
C) 240
D) 250
Correct Answer: A
Solution :
[a] Let the resistance of half the turn be R. Then in the former case, we have fifteen resistors of resistance R connected in parallel, the total resistance being R/15. In the latter case, we have the same fifteen resistors connected in series, the total resistance being 15R. Therefore, as a result of unwinding, the resistance of the wire will increase by a factor of 225.You need to login to perform this action.
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