Year: 2023
Topic: Current electricity
Time :
1.
The resistance of platinum wire at \(0^\circ C\) is \(2 \Omega\) and \(6.8 \Omega\) at \(80^ \circ C\). The temperature coefficient of resistance of the wire is
(1). \(3 \times 10^{−3\,\,^\circ} C^{−1} \)
(2). \(3 \times 10^{−2\,\, \circ} C^{−1}\)
(3). \(3 \times 10^{−1}C^{−1} \)
(4). \(3 \times 10^{−4\,\, \circ}C^{−1} \)