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A potentiometer having a wire of length ...

A potentiometer having a wire of length 10 m and resistance `20 Omega` is connected to an accumulator of e.m.f. E through a resistance box. When the resistance in the box is `20Omega,` a null point is observed at 5 m for a cell of e.m.f. `E_(1)`. The ratio of E to `E_(1)` is

A

`1//4`

B

`2//1`

C

`3//1`

D

`4//1`

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TARGET PUBLICATION-CURRENT ELECTRICITY -Critical Thinking
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  2. The material of wire of potentiometer is

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  9. The e.m.f. E of the battery is balanced by p. d. across 75 cm of a pot...

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  10. A potentiometer having a wire of length 10 m and resistance 20 Omega i...

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  11. When two cells of e.m.f. 1.5 V and 1.1 V connected in series are bala...

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  12. When a balance point is obtained in a potentiometer for finding the in...

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  13. With resistances P and Q in the left and right gaps of a metre bridge...

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  14. A cell of e.m.f. 2 V and negligible internal resistance is connected i...

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  15. An accumulator of 4 V is connected through a resistance of 30Omega to ...

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  16. A potentiometer has uniform potential gradient. The specific resistanc...

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