Question

A wire is doubled over i tsel f . What wi l l be the new resistance i f the
Original resistance is 4 ohms?

Answer 1

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Answer 2

wire is doubled so area is increased by 4 times.
now resistance varies inversely with area so now resistance is 4/4=1

Answer 3

resistance proportional to (length/area). in this case length halves and area cross section doubles. so new resistance is 1/4 times original resistance..therefore ans is 1 ohm..