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Masses of three wires of copper are in t...

Masses of three wires of copper are in the ratio 1 : 3 : 5 and their lengths are in the ratio 5 : 3 : 1 The ratio of their electrical resistance are

A

`1:15: 125 `

B

`1:3:5 `

C

`125: 15:1 `

D

`5:3:1 `

Text Solution

Verified by Experts

The correct Answer is:
C
`R alpha (1)/(A) ,m = rho v= rho .Al`
` R alpha (1)/(A ) , alpha (I^2)/(m)`
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