Question

A wire of resistance 5ohm is bent in the form of a closed circle what is the effective resistance between the two points at any end of diameyer of a circle

Answer 1

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Answer 2

Answer:

1.25 ohm

Explanation:

Before bending into circle, resistance is:

R= RHO x length / area

5ohm= RHO x length/ area....(1)

after bending;

R'= RHO x length / 2x area

i.e, R'=1/2 X 5 [ substuting (1) ]

Therefore the two resistance will be in parallel. So,

1/R = 1/R' + 1/R'

1/R = 2/5 + 2/5

1/R = 4/5

R = 1.25 OHM