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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 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.

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