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If the emf of the driving cell be decrea...

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 e.m.f. deceases ` rArr (V)/(l) ` decreases ` rArr ` position of zero deflection increases.
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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.

If the length of the wire be (i) doubled and (ii) halved, what will be effect on the position of zero deflection in a potentiometer ? Explian

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.

CBSE COMPLEMENTARY MATERIAL-ELECTROSTATICS AND CURRENT ELECTRICITY -SHORT ANSWER QUESTIONS (2 MARKS)
  1. A battery has an emf of 12V and an internal resistance of 2 Omega. C...

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  2. In a potentiometer arrangment, a cell of emf 1.25 V gives a balance po...

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  3. In a meter bridge, the balance point is found to be 39.5 cm from end A...

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  4. A meterbridge is in balance condition. Now if galvanometer and cell ar...

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  5. If the emf of the driving cell be decreased, what will be effect on th...

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  6. Why should the area of cross-section of the meter-bridge wire be unifo...

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  7. Given any two limitations of Ohm’s law.

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  8. Which one of the two, an ammeter or a milliammeter, has a higher resis...

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  9. Name two factors on which the resistivity of a given material depends ...

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  10. If the electron drift speed is so small (~ 10 ^(-3) m//s) and the e...

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  11. A battery of emf 2.0 volts and internal resistance 0.1 Omega is bein...

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  12. Why should the jockey be not rubbed against potentiometer wire ?

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  13. What is meant by the sensitivity of a potentiometer of any given lengt...

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  14. Five identical cells, each of emf E and internal resistance r, are con...

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  15. An electron in a hydrogen atom is considered to be revolving around a ...

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  16. In the given circuit, with steady current, calculate the potential dro...

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  17. .A cell of emf E and internal resistance r is connected across a varia...

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  18. Winding of rheostat wire are quite close to each other why do not they...

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  19. Why is it necessary to obtain the balance point in the middle of bridg...

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  20. What are the possible cause of one side deflection in Galvanometer whi...

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