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A cell of emf (E) and internal resistanc...

A cell of emf (E) and internal resistance (r) is balanced across (l) length of potentiometer wire. If another cell of emf 2E and internal resistance (2r) is connected in parallel to the first cell , then the balancing length will be

A

` 1//3`

B

` 21//3`

C

` 41//3`

D

` 21 `

Text Solution

Verified by Experts

The correct Answer is:
C
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MOTION-Electrical Instrument -EXERCISE -2
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  2. To send 10% of the main current through a moving coil galvanometer of ...

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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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