The following four wires are made of the...

The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance

A

Length = 50 cm, diameter = 0.5 mm

B

Length = 100 cm, diameter = 1 mm

C

Length = 200 cm, diameter = 2 mm

D

Length = 300 cm, diameter = 3 mm

Verified by Experts

The correct Answer is:

A

`R =(rho l)/A = (rho l)/((pi d^(2))/4) rArr R prop l/d^(2)`

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