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In a potentiometer, the null point is re...

In a potentiometer, the null point is received at 7th wire. If now we have to change the null point at 9th wire, what should we do?

A

Attach resistance in series with battery

B

Increase resistance in main circuit

C

Decrease resistance in main circuit

D

Decrease applied emf

Text Solution

Verified by Experts

The correct Answer is:
B
To shift the balance point an higher length, the potential gradient of the wire is to be decreased the same can be obtained by decreasing the current of the main circuit, which is possible by increasing the resistance in series of potentiometer wire.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-CURRENT ELECTRICITY-EXERCISE 2
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  7. If an increase in length of copper wire is 0.5% due to stretching, the...

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  8. In a neon discharge tube 2.9 xx 10^(18) Ne^(+) ions move to the right ...

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  9. If the resistivity of an alloy is and that of constituent metal is p,...

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  10. In a network as shown in the figure the potential difference across th...

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  11. A wire of lenth L is drawn such that its diameter is reduced to half o...

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  16. The current through a wire depends on time as, i=(10+4t) Here , i is a...

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  17. In cosmic rays 0.15 protons cm^(-2) s^(-1) are entering the Earth's at...

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  18. Consider a thin square sheet of side L and thickness t, made of a mate...

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  19. 160W-60V lamp is connected at 60 V DC supply. The number of electrons ...

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