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(a) The potential difference applied acr...

(a) The potential difference applied across a given resistor is altered so that the heat produced per second increases by a factor of `9` . By what factor does the applied potential difference change?

(b) In the figure shown, an ammeter `A` and a resistor of `4` `Omega` are connected to the terminals of the source . The emf of the source is `12V` having an internal resistance of `2` `Omega`.
Calculate the voltmeter and ammeter readings.

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