Question

A wire in a circular shape has 10 Ω resistance. The resistance of wire per 1 m length is 1 Ω. If the equivalent resistance betwen A and B is 2.4 Ω, then the length of the chord AB will be equal to ______ meter.
(A) 2.4
(B) 4
(C) 4.8
(D) 6

Answer 1

as 1m=1ohm
then a 10 ohm wire has 10 m length
2pie×radius =10m
then R=5/pie
then solve further for answer