A student measures the terminal potential difference `(V)` of a cell (of emf `epsilon` and internal resistance `r`) as a function of the current `(I)` flowing through it. The slope and intercept of the graph between `V` and `I`, then respectively, equal

Options

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

Answer

C

Explanation

`E=V+Ir`
`implies V=E-Ir `
Comparing with `y=mx+c `
Slope ` =-r ` , intercept =E