Q. If the potential difference V applied across a conductor is increased to 2V with its temperature kept constant, free electrons in a conductor will –
(i) remain the same
(ii) become half of its previous value
(iii) be double of its initial value
(iv) become zero.
Answer: (iii) be double of its initial value
If temperature is kept constant, relaxation time t – will remain constant, and e, m are also constants.
Vd α V
Vd α 2V
Correct option is (iii)