(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
4Ω are connected to the terminals of the source. The emf of the source is
12V having an internal resistance of
2Ω. Calculate the voltmeter and ammeter reading.
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