A heating element has a resistance of at room temperature

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

A heating element has a resistance of

100 \Omega

at room temperature. When it is connected to a supply of

220 \text{ V}

, a steady current of

2 \text{ A}

passes in it and temperature is

500^\circ \text{C}

more than room temperature. What is the temperature coefficient of resistance of the heating element? (1)

1 \times 10^{-4} \text{ }^\circ\text{C}^{-1}

(2)

5 \times 10^{-4} \text{ }^\circ\text{C}^{-1}

(3)

2 \times 10^{-4} \text{ }^\circ\text{C}^{-1}

(4)

0.5 \times 10^{-4} \text{ }^\circ\text{C}^{-1}