A nichrome wire has a resistance of at

PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity

Problem

A nichrome wire has a resistance of

10\,\Omega

25^\circ\text{C}

. With a constant potential difference of

24\,\text{V}

applied, the wire heats up so that its resistance becomes

12\,\Omega

. Which of the following describes the change in current through the wire? (a) It increases from

2.0\,\text{A}

2.4\,\text{A}

. (b) It remains constant at

2.4\,\text{A}

. (c) It decreases from

2.4\,\text{A}

2.0\,\text{A}

. (d) It decreases from

2.4\,\text{A}

1.5\,\text{A}