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Standard XII

Physics

Field Due to a Solenoid

For the arran...

Question

For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75cm from A when the key k is open. The second balance point is obtained at 60 cm from A when the key k is closed. Find the internal resistance (in $Ω$ ) of the battery $E_{1}$ . ___

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Solution

$r = (\frac{l_{1} - l_{2}}{l_{2}}) R = (\frac{75 - 60}{60}) 24 = 6 Ω$

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Similar questions

Q. For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75 cm from A when the key k is open. The second balance point is obtained at 60 cm from A when thekey k is closed. Find the internal resistance (in

Ω

) of the battery

E_{1}

Q. In fig.,

A B

is a potentiometer wire of length

10 m

and resistance

2 Ω

. With key

(K)

open the balancing length is

5.5 m

. However, on closing key

(K)

the balancing length reduces to

5 m

. The internal resistance of the cell

(E_{1})

is –

Q. The internal resistance of a cell is to be determined using a potentiometer. In an experiment, an external resistance of

R

=

60 Ω

is used across the given cell. When the key

K_{1}

is closed and

K_{2}

is open, the balance point is found at a length of

72

cm

. The balance length on the potentiometer is found at

60

cm

when both the keys are closed. Calculate the internal resistance of the cell.

Q. In fig.,

A B

is a potentiometer wire of length

10 m

and resistance

2 Ω

. With key

(K)

open the balancing length is

5.5 m

. However, on closing key

(K)

the balancing length reduces to

5 m

. The internal resistance of the cell

(E_{1})

is –

Q. A potentiometer PQ is set up to compare two resistance as shown in the figure. The ammeter A in the circuit reads 1.0 A when two way key

K_{3}

is open. The balance point is at a length

l_{1}

cm from P when two way key

K_{3}

is plugged between 2 and 1, while the balance point is at a length

l_{2}

cm from P when key

K_{3}

is plugged between 3 and 1. The ratio of two resistances

\frac{R_{1}}{R_{2}}

, is found to be

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For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75cm from A when the key k is open. The second balance point is obtained at 60 cm from A when the key k is closed. Find the internal resistance (in Ω) of the battery E1. ___

r=(l1−l2l2)R=(75−6060)24=6Ω

For the arrangement of the potentiometer shown in the figure, the balance point is obtained at a distance 75cm from A when the key k is open. The second balance point is obtained at 60 cm from A when the key k is closed. Find the internal resistance (in $Ω$ ) of the battery $E_{1}$ . ___

$r = (\frac{l_{1} - l_{2}}{l_{2}}) R = (\frac{75 - 60}{60}) 24 = 6 Ω$