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Factors Affecting Resistance & How They Affect

If n,e,tau,m ...

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If n,e,tau,m are representing electron density , charge, relaxation time and mass of an electron respectively then the resistance of wire of length l and cross sectional area A is given by

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n

e

τ

m

are representing electron density, charge, relaxation time and mass of an electron respectively then the resistance of wire of length

l

and cross sectional area

A

Q. If n, e, t and m are respectively the density, charge, relaxation time and mass of an electron then the resistance of wire of length / and cross-sectional area A, will be

Q. Find the current flows through a copper wire of length 0.2 m, area of cross-section

1 m m^{2}

, when connected to a battery of 4V. Given that electron mobility is

4.5 \times 10^{-} 6 m^{2} s^{-} 1

and charge on an electron is

1.6 \times 10^{- 19} C

The number density of electron in copper wire is

8.5 \times 10^{2} 8 m^{3}

Q. The mobility of free electrons (charge =e, mass = m and-relaxation time

τ

) in a metal is proportional to :

Q. If the conduction-electron density in copper wire is

n

, the area of cross-section of wire is A and the average drift speed of electron

V_{d}

, then the net number of electrons crossing a cross-section of the wire in a unit time interval

t

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