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The resistance of a coil is 4.2Omega at ...

The resistance of a coil is `4.2Omega` at `100^(@)C` and the temperature coefficient of resistance of its material is `(0.004)/(.^(@)C)`. Its resistance at `0^(@)C` is

A

`6.5 Omega`

B

`5 Omega`

C

`3 Omega`

D

`2.5 Omega`

Text Solution

Verified by Experts

The correct Answer is:
C
`R_(t) =R_(0) (1+alphat)`
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