Heating copper raises its resistivity mainly through which change?
AMore free electrons per volume
BShorter time between collisions
CSmaller charge on each electron
DLarger mass of each electron
Answer & Solution
Correct answer: B. Shorter time between collisions
In a metal the free electron density hardly changes with temperature, so the shorter average collision time at higher temperature makes resistivity increase.
Related questions
Why is a Wheatstone bridge used with strain gauges?The electrical resistance of a strain gauge is proportional to which quantity?The ratio arms P and Q of a post office box contain which set of resistance values?A post office box is a practical form of which instrument?Which is NOT needed for potential to vary linearly along a potentiometer wire?On a potentiometer wire with steady current, potential difference is proportional to what?Potential gradient along a potentiometer wire is defined as the potential difference per wAn ideal voltmeter should have what value of resistance?