Question 39: Current Electricity

Question

A student measures the terminal potential difference $V$ of a cell (emf $\varepsilon$ and internal resistance $r$ ) as a function of current I flowing through it, and draws V versus I graph. The slope and intercept of the graph respectively are

Accepted Answer

If you plot V (y-axis) against I (x-axis), the relation is
$$V = \varepsilon - r\,I$$
This is a straight line of the form
$$V = (-r)\,I + \varepsilon\,,$$
so the slope is $-r$ and the intercept is $\varepsilon$.
Answer: Option B.

Answer

$-r,-\varepsilon$

Answer

$-r, \varepsilon$

Answer

$r,-\varepsilon$

Answer

$r, \varepsilon$

Current Electricity

A student measures the terminal potential difference V of a cell (emf \varepsilon and internal resistance r ) as a function of current I flowing through it, and draws V versus I graph. The slope and intercept of the graph respectively are

Choose the correct answer: