SECTION-C (a) The potential difference applied across a ...

CBSE Class 12 Physics 2017 Outside Delhi Set 1 Paper

Question : 11

Total: 26

SECTION-C

(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 2 Ω. Calculate the voltmeter and ammeter readings.

Solution:

(a) The factor by which the potential difference changes
(b) Voltmeter reading
Ammeter Reading
(a) (H=‌

)
∴V increases by a factor of √9=3
(b) Ammeter Reading I‌=‌

R+r

‌=‌

4+2

A=2A
Voltmeter Reading V=E−Ir
=[12−(2×2)]V=8V

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