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The length of a wire of a potentiometer ...

The length of a wire of a potentiometer is 100 cm, and the emf of its cell is E volt. It is employed to measure the emf of a battery whose internal resistance is `0.5Omega`. If the balance point is obtained at l = 30 cm from the positive end, the emf of the battery is

A

`(30E)/100.5`

B

`(30E)/(100-0.5)`

C

`(30(E-0.5i))/100`, where I is the current in the potentiometer wire

D

`(30E)/100`

Text Solution

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-Mock Test 28-EXAMPLE
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  2. The current in the primary circuit of a potentiometer is 0.2 A. The sp...

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  3. The length of a wire of a potentiometer is 100 cm, and the emf of its ...

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  4. In the figure the potentiometer wire AB of length L and resistance 9 r...

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  5. Potentiometer is superior to voltmeter because

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  6. The figure shows a potentiometer arrangement. D is the driving cell, C...

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  7. A charge + Q is moving upwards vertically. It enters a magnetic field ...

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  8. If an electron enters a magnetic field with its velocity pointing in t...

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  9. When a charged particle enters ina uniform magnetic field then its kin...

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  10. If a charged particle is moving in a plane perpendicular to a uniform ...

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  11. In a magnetic field vecB=hati+yhatj+3hatk a charge particle (q, m) is ...

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  12. If a chraged particle at rest experiences no electromagnetic force, ...

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  13. An electron is moving along the positive x-axis . A uniform electr...

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  14. A charged particle has acceleration veca=2hati+xhatj in a magnetic fie...

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  15. The force vecF experienced by a particle of charge q moving with a vel...

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  16. If a proton is projected in a direction perpendicular to a uniform mag...

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  17. An electron is moving along positive x-axis. To get it moving on an an...

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  18. Two particle X and Y having equal charge, after being accelerated thro...

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  19. An electron enters a region where magnetic field (B) and electric fiel...

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  20. Lorentx force can be calculated by using the formula.

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