1.

a cell of EMF E1 balances a length of 150cm of potentiometer wire, another cell of EMF 2V balances a length of 300cm of wire, EMF el is O 1V O 1.5 V 2.5 V 0 v 0.1 V​

Answer»

Answer:

Correct option is

A

1 ohm

Given,

Length of the potentiometer wirel

1

=150cm

Resistance R=5Ω

balancing length is OBTAINED at L

2

=125cm

Internal resistance r=?

we have,

r=R[

l

2

l

1

−1]

=5[

125

150

−1]

=5[

125

25

]

=1Ω



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