What will be the internal resistance of a cell of emf 2.2 V which gives a current of 0.2 A through a resistance of 10 Ω?

1.0 Ω

The correct answer is Option (3) → 1.0 Ω

Given:

EMF, $E = 2.2\text{ V}$

External resistance, $R = 10\ \Omega$

Current, $I = 0.2\text{ A}$

Using the relation:

$E = I(R + r)$

Substituting values:

$2.2 = 0.2(10 + r)$

$2.2 = 2 + 0.2r$

$0.2 = 0.2r$

$r = 1\ \Omega$

∴ Internal resistance of the cell = $1\ \Omega$