`AB` is a potentiometer wire of length `100 cm` and its resistance is `10 ohms`. It is connected in series with a resistance `R = 10 ohms` and a battery of e.m.f. `2 V` and negligible internal resistance. If a source of unknown e.m.f. `E` is balanced by `40 cm` length of the potentiometer wire, the value of `E` is A. `0.8 V`B. `1.6 V`C. `0.08 V`D. `0.16 V`

`AB` is a potentiometer wire of length `100 cm` and its resistance is

1.	`AB` is a potentiometer wire of length `100 cm` and its resistance is `10 ohms`. It is connected in series with a resistance `R = 10 ohms` and a battery of e.m.f. `2 V` and negligible internal resistance. If a source of unknown e.m.f. `E` is balanced by `40 cm` length of the potentiometer wire, the value of `E` is A. `0.8 V`B. `1.6 V`C. `0.08 V`D. `0.16 V`
Answer» Correct Answer - D (d) `E = (e)/((R + R_(h) = r)) (R )/(L) xx l` `= (2)/((10 + 40 + 0)) xx (10)/(1) xx 0.4 = 0.16 V`

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