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Resistance or coil at 100^(@)C is 4.2 Om...

Resistance or coil at `100^(@)`C is 4.2 `Omega`. If temperature co-efficient of resistance of material is 0.004 `(""^(@)C)^(-1)` so what will be its resistance at `0^(@)C` ?

A

`5 Omega`

B

`3 Omega`

C

`4 Omega`

D

`3.5 Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
`3 Omega`
`R_(t) = R_(0) [ 1 + alpha t]`
` therefore R_(0) = (R_(t))/(1 + alpha t) = (4.2)/(1 + 0.004 xx 100) = 3 Omega`
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