Question

How does the current density in a conductor varies with the increase in temperature and length? pls tell correct answer

Answer 1

Answer:

If potential difference V is applied across a conductor of length 'l' and area of cross-section 'A' having number of free electrons per unit volume n. ... (a) current density increases with increase in potential gradient . (b) when temperature increases, relaxation time (τ) decreases and current density decreases.

Answer 2

Answer:-

Current-density is a vector quantity. If potential difference V is applied across a conductor of length 'l' and area of cross-section 'A' having number of free electrons per unit volume n. (b) when temperature increases, relaxation time (τ) decreases and current density decreases.

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