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 

Create a free account to view solution

View Solution Free
Topic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions

More Current Electricity and Electrical Instrument Questions

If the ratio of the concentration of electrons that of holes in a semiconductor is and the ratio of currents is , then w...Current sensitivity of a moving coil galvanometer is 5 div/mA and its voltage sensitivity (angular deflection per unit v...Which of the following is scalar : -...Resistance in the two gaps of a meter bridge are 10 ohm and 30 ohm respectively. If the resistances are interchanged the...By increasing the temperature, the specific resistance of a conductor and a semiconductor...