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The resistance in the three arms of a Wh...

The resistance in the three arms of a Wheatstone bridge are repectively `15Omega , 10Omega and 22.5Omega.` when a copper coil is placed in the fourth arm of the bridge at `0^(@)C` the bridge ramains balanced . But to restore the balance of the bridge at `50^(@)C ` of the coil temperature an additinal resistance r has to be arranged in parallel with the coil . What is the value or ? (temperture cofficient of resistance of copper `=0.00425^(@)C^(-1)`

Text Solution

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The correct Answer is:
`85.6Omega`
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