A cell of emf E is connected across an external resistance ...

CBSE Class 12 Physics 2023 Outside Delhi Set 1 Paper

Question : 4 of 35

Marks: +1, -0

A cell of emf E is connected across an external resistance R. When current ' T ' is drawn from the cell, the potential difference across the electrodes of the cell drops to V. The internal resistance ' r ' of the cell is

(‌
E−V
E
)R
(‌
E−V
R
)
‌
(E−V)R
I
(‌
(E−V)
V
)R

Solution: 👈: Video Solution

Since, ‌‌I=‌

R+r

So, E=Ir+V
∴‌‌r=‌

E−V

Or, ‌‌r=(‌

E−V

)R‌‌[∵V=IR]

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