Ncert Exercises & Solutions

A cell of emf E and internal resistance r is connected across an external resistance R. Plot a graph showing the variation of potential differential across R, versus R.

Hint: The potential difference across R depends on the current in R.

Step 1: Find the current in the circuit.

The current in the circuit,

i = \frac{E}{R + r}

Step 2: Find the potential difference across R.

The potential difference across R,

V_{R} = iR = (\frac{E}{R + r}) R

Step 3:

The graphical relationship between the voltage across R and the resistance R is given below:

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions