If the emf of the driving cell be decreased, what will be effect on the position of zero deflection in a potentiometer ? Explain .
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If the emf of the driving cell is decreased, the potential gradient across the potentiometer wire will decrease. Due to it, the position of zero deflection will be obtianed on longer length.
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If the current flowing in the wire of the potentiometer be decreased, what will be effect on the position of zero deflection in potentiometer ? Explain.
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Rohan, a Science student purchased a few cells from a shop keeper for his torch. He noticed that the torch was not working will with these new cells. He thought of checking the emf of each cell. Using a potentiometer he measured their emfs and noticed that the emf of each cell was less than the value of oblige him. He then lodged a complaint with consumer forum and got theredressal. Read the above passage and answer the following question: (i) What are the basic values displayed by Rohan? (ii) Why rohan used potentiometer instead of voltmeter to measure emf of the cells? (iii) If the lenght of potentiometer wire is (a) doubled and (b) halved, what will be the effect on the position of zero deflection in a potentiometer.
What is the unit of potential-gradient ? If the potential gradient along the potentiometer wire be decreased, will the zero-deflection position be obtained at longer length or shorter length ?
The emf of the driving cell used in the main circuit of the potentiometer should be more than the potential differnce to be measured. Why?
State the working principle of potentiometer. With the help of the circuit diagram, explain how a potentiometer is used to compare the emf's of two primay cells. Obtain the required expression used for comparing the emfs. Write two possible causes for one sided deflection in a potentiometer experiment.
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