Resistance of conductor increases with increase in temperature because ....

Options

A. electron density increases
B. electron density decreases
C. relaxation time increases
D. relaxation time decreases.

Answer

D

Explanation

relaxation time decreases.
In R= `(rho l)/(A) , (l)/(A) ` is same
`therefore R prop rho `
`therefore rho = (m)/("ne"^(2) tau)`
`therefore R = (m)/("ne"^(2) tau)`
`therefore R prop (1)/(tau)` (other terms are constant ) `therefore " Where " tau ` decreases, R increases,