At `27^(0)C` in a copper cube, a number of free electrons is `8.5times10^(28)m^(-3)` ,resistivity is `1.7times10^(-8)Omega-m`. If mean free path of electrons is estimated as `5NA^(0)` then `N` is

Find the relaxation time for free electrons in copper, if the density of mobile electrons in copper, if the density of mobile electrons is 8.4 xx10^(28) m^(-3) . The resistivity of copper at room temperature is 1.7xx10^(-8)Omega m . Given : mass of electron =9.11 xx10^(-31) kg and charge on electron =1.6xx10^(-19)C .

A small insect crawls in the direction of electron drift along bare copper wire that carries a current of 2.56A. It travels with the drift speed of the electron in the wire of uniform cross-section area 1mm^2 Number of free electrons for copper = 8 times 10^28// cc and resistivity of copper = 1.6 times 10^-8 Omega m How much time would the insect take to crawl 1.0 cm if it crawls at the drift speed of the electron in the wire?

If in a conductor number density of electrons is 8.5xx10^(28) average relaxation time 25 femtosecond mass of electron being 9.1xx10^(-31) kg, the resistivity would be of the order.

Calculate the resistance of 1 km long copper wire of radius 1 mm. (Resistivity of copper is 1.72 xx10^(-8) Omega m ).

A straight copper-wire of length 100m and cross-sectional area 1.0mm^(2) carries a current 4.5A . Assuming that one free electron corresponds to each copper atom, find (a) The time it takes an electron to displace from one end of the wire to the other. (b) The sum of electrostatic forces acting on all free electrons in the given wire. Given resistivity of copper is 1.72xx10^(-8)Omega-m and density of copper is 8.96g//cm^(3) .

A current , 32 A, is made to pass through a conductor where the free electrons density is 4 xx 10^(28) m^(-3) and its area of cross section is 10^(-6) m^(2) . Find out the value of the drift velocity ( in mm // s ) of free electrons.

The total number of current careers in intrinsic semiconductor of dimensions 1m×1m×10^(-2)m having number of free electrons n_e=5×10^8 per cubic metre is

A copper wire of cross - sectional area 3.4 m m^(2) and length of the wire 400m, specific resistivity of copper is 1.7 xx 10^(-8)Omega-m . Then the resistance of the wire is

A n-type silicon sample of width 4 xx 10^(-3)m , thickness 25 xx 10^(-5)m and length 6 xx 10^(-2)m carries a current of 4.8 mA when the voltage is applied across the length of the sample. If the free electron density is 10^(22)m^(-3) , then find how much time does it take for the electrons to travel the full length of the sample? Given that charge on an electron e=1.6 xx 10^(-19)C