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The potential difference (V) across a so...

The potential difference (V) across a source in a circuit is not equal t oits emf (e). This is due to the reason that every source of electric energy has some internal resistance (r). Further,`epsilon` V and r are related to each other as `V=epsilon-lr.` A single battery shown in Fig. consists of two cells of emfs`epsilon_1` and `epsilon_2` and internal resistance `r_1` and `r_2` respectively in series. With the help of the comprehension given above choose the most appropriate alternative to each of the following questions.
The current in the internal circuit is :

A

zero

B

`(epsilon_2-epsilon_1)/(r_1+r_2`

C

`(epsilon_1+epsilon_2)/(r_1+r_2`

D

`(epsilon_1-epsilon_2)/(r_1+r_2`

Text Solution

Verified by Experts

The correct Answer is:
C
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