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  • Potential difference across terminal of a cell is 2V when it is connect with an external resistance of 4. The inter

Potential difference across terminal of a cell is 2V when it is connect with an external resistance of 4\Omega. The internal resistance (in \Omega) of a cell if its emf =2.5V is?

Option: 1

1


Option: 2

0.5


Option: 3

1.5


Option: 4

2


Answers (1)

best_answer

As we learnt

Internal resistance of the cell -

r=(\frac{E}{V}-1)R

-

 E=2.5V

V=2V, R=4\Omega

\Rightarrow r=\left ( \frac{2.5}{2}-1 \right )*4\Omega= 1\Omega

 

Posted by

manish

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