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Masses of 3 wires of same metal are in t...

Masses of 3 wires of same metal are in the ratio `1 : 2 : 3` and their lengths are in the ratio `3 : 2 : 1`. The electrical resistances are in ratio

A

`1:4:9`

B

`9:4:1`

C

`1:2:3`

D

`27:6:1`

Text Solution

Verified by Experts

`R propto (I^2)/m to R_1:R_2:R_3=(I_1^2)/(m_1):(I_2^2)/(m_2):(I_3^2)/(m_3)`
`rArrR_1:R_2,R_3=9/1:4/2:1/3=27:6:1`
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