Question 688: Current Electricity

Question

A student measures the terminal potential difference (V) of a cell (of emf $$\varepsilon $$ 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

Accepted Answer

The terminal potential difference of a cell is given by V + Ir = $$\varepsilon $$
V = V
A
Ã¢ÂÂ V
B
$$ \Rightarrow $$  V = $$\varepsilon $$ Ã¢ÂÂ Ir
$$ \Rightarrow {{dV} \over {dI}} =  - r$$,  Also for,  i = 0 then V = $$\varepsilon $$
$$ 	herefore $$ slope = Ã¢ÂÂ r, intercept = $$\varepsilon $$

Answer

$$-$$ r and $$\varepsilon $$

Answer

r and $$-$$ $$\varepsilon $$

Answer

$$-$$ $$\varepsilon $$ and r

Answer

$$\varepsilon $$ and $$-$$ r

Current Electricity

A student measures the terminal potential difference (V) of a cell (of emf $\varepsilon $ 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

Choose the correct answer: