Physics Crash Course MHT-CET>Chapter 15 - Current Electricity>Exercise 1>Q 216

EASY

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IMPORTANT

Earn 100

Assertion: We prefer a potentiometer with a longer bridge wire.

Reason: By doing this, the sensitivity of the bridge is increased because for longer wire potential drop per unit length will be small.

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Important Questions on Current Electricity

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Physics Crash Course MHT-CET>Chapter 15 - Current Electricity>Exercise 1>Q 217

In potentiometer a balance point is obtained, when

EASY

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IMPORTANT

Physics Crash Course MHT-CET>Chapter 15 - Current Electricity>Exercise 1>Q 218

The length of a potentiometer wire is

ℓ

. A cell of emf

E

is balanced at a length

\frac{ℓ}{3}

from the positive end of the wire. If the length of the wire is increased by

\frac{ℓ}{2}

. At what distance will be the same cell given a balance point.

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Physics Crash Course MHT-CET>Chapter 15 - Current Electricity>Exercise 1>Q 219

In the potentiometer circuit of the figure, when the key $K$ is inserted, balanced length is found to be $20 cm$ for $R = 10 Ω$ and $24 cm$ for $R = 20 Ω$ . The balanced length if $key K$ is taken out will be,

Question Image

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Physics Crash Course MHT-CET>Chapter 15 - Current Electricity>Exercise 1>Q 220

A cell when balanced with potentiometer gave a balanced length of

50 cm

.

4.5 Ω

external resistance is introduced in parallel with the cell in the secondary circuit, now it is balanced on

45 cm

. The internal resistance of the cell is:

EASY

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Physics Crash Course MHT-CET>Chapter 15 - Current Electricity>Exercise 1>Q 221

A potentiometer consists of a wire of length

4 m

and resistance

10 Ω

. It is connected to a cell of emf

3 V

. The potential gradient of wire is

EASY

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IMPORTANT

Physics Crash Course MHT-CET>Chapter 15 - Current Electricity>Exercise 1>Q 222

In potentiometer experiment, null point is obtained at a particular point on the potentiometer wire for a cell. If the length of the potentiometer wire is increased without changing the driving cell, the balancing length will