(a) An electric iron rated $2\cdot 2\text{ kW}, 220\text{ V}$ is operated at $110\text{ V}$ supply. Find : (i) its resistance, and (ii) heat produced by it in 10 minutes. OR (b) A current of $4\cdot 0\text{ A}$ flows through a wire of length $1\text{ m}$ and cross-sectional area $1\cdot 0\text{ mm}^2$, when potential difference of $2\text{ V}$ is applied across its ends. Calculate the resistivity of the material of the wire.

Year	Paper Code	Set	Position
CBSE 2026	Series 55-5	Set 1	Question 17
CBSE 2026	Series 55-5	Set 2	Question 19
CBSE 2026	Series 55-5	Set 3	Question 21

• Step 1: Stating the fundamental formula / law statement (+1 Mark)
• Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
• Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)