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The circuit shows in Fig . 6.33 shows th...

The circuit shows in Fig . `6.33` shows the use of potentiometer to measure the internal resistance of a cell.
(a) When the key is open, how does the balance point change, if the driver cell decreases ?
(b) When the key is closed, how does the balance point change, if `R` is increased, keeping the current from the driver cell constant ?

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