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The resistivity of a potentiometer wire ...

The resistivity of a potentiometer wire is `40xx10^(-8)Omega-m` and its area of cross section is `8xx10^(-6)m^(2)`. If 0.2 A current is flowing through the wire the potential gradient will be

A

` 10^(-2) V//m`

B

` 10 V//m`

C

`1.6xx 10 ^(-2) V//m`

D

none of the above

Text Solution

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The correct Answer is:
A
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MOTION-Electrical Instrument -EXERCISE -2
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  3. In the given potentiometer circuit length of the wire AB is 3 m and re...

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  4. A potentiometer wire 10 m long has a resistance 40ohms. It is put in s...

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  5. The length of a potentiometer wire required to balance the e.m.f of ce...

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  6. In figure, AB is a potentiometer wire, length 10 m and resistance 2 Om...

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  7. A potentiometer experiment is setup as shown in fig. If both the galva...

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  8. A cell of emf (E) and internal resistance (r) is balanced across (l) l...

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  9. In a potentiometer arrangement shown in fig. The balancing length for ...

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  10. The resistivity of a potentiometer wire is 40xx10^(-8)Omega-m and its ...

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  11. A battery of emf 26V and internal resistance 0.4 ohm is connected to ...

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  12. A cell of two volt and 1.5 ohm internal resistance is connected to two...

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  13. Three wires are connected in series having resistances 2 , 3 and 5 ohm...

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  14. A ten meter long potentiometer wire is connected to accumulator of emf...

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  15. In an experiment to measure the internal resistance of a cell by a pot...

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  16. Statement I : Potentiometer is based on wheatstone bridge. Statem...

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  17. Statement I : Material used in the construction of a standard resista...

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  18. Statement -1 : A potentiometer of longer length is used for accurate m...

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  19. Assertion : The e.m.f. of the drivercell in the potentiometer experime...

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  20. Statement I : If galvanometer is converted into an ammeter and milli...

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