A student measure the terminal potential difference `(V)` of a cell (of `emf` internal energy is connected in providing the circuit is

Options

A. `-r and epsilon`
B. `r and -epsilon`
C. ` -epsilon and r`
D. ` epsilon and -r`

Answer

a

Explanation

Terminal pot diff. `V= epsilon - 1 r= - 1 r + epsilon`…..(i)
It shown as `I` increase `V` decrease
The variation of `V` and `I` will be a straight line with negative slope

Comparing (i) with , `y = mx + c`, we have
`:.` slope, `m = -r`, intercept `c = epsilon`