Question

A cell of internal resistance r is connected across an external resistance nr. Then the ratio of the terminal voltage to the emf of the cell is ______.

पर्याय

• `1/"n"`

• `1/("n"+1)`

• `"n"/("n"+1)`

• `("n"-1)/"n"`

Answer 1

A cell of internal resistance r is connected across an external resistance nr. Then the ratio of the terminal voltage to the emf of the cell is `underlinebb("n"/("n"+1))`.

Explanation:

Internal resistance = r,

External resistance = nr

Let terminal voltage = V

then V = E - Ir ⇒ V = E - `"Er"/(("n"+1)"r")`

V = `"nE"/("n"+1)` 

⇒ `"V"/"E"`

= `"n"/("n"+1)`