1.

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

Answer»

electron density increases
electron density decreases
RELAXATION TIME increases
relaxation time decreases.

Solution :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,


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