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A galvanometer (coil resistance 99Omega)...

A galvanometer (coil resistance `99Omega`) is converted into an ammeter using a shunt of `1Omega` and connected as shown in figure (a). The ammeter reads 3A. The same galvanometer is converted into a voltmeter by connecting a resistance of `101Omega`series. This voltmeter is connected as shown in figure (b). Its reading if found to be `4/5`of the full scale reading. Find
internal resistance r of the cell.

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