Current Electricity and Electrical InstrumentHard

Question

In a potentiometer wire experiment the emf of a battery in the primary circuit is 20volt and its internal resistance is 5Ω. There is a resistance box (in series with the battery and the potentiometer wire) whose resistance can be varied from 120Ω to 170Ω. Resistance of the potentiometer wire is 75Ω. The following potential differences can be measured using this potentiometer

Options

A.5V
B.6V
C.7V
D.8V

Solution


imax = amp
Vmax = imax R75 = × 75 = 7.5 V
range of potentiometer 0 to 7.5 V 

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