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 ?

(a) The potential difference applied across a given resistor is altered so that the heat produced per secound increases by a factor of 9 . By what factor does the appliced potential difference change ? (b) In the figure shown, an ammeter A and a resistor of 4 Omega are connected to the terminals of the socrce . The emf of the source is 12 V having an internal resisitance of 2 Omega Calculate the voltmeter and ammeter readings.

If the potential difference applied across a Coolidge tube is increased , then

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