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Every atom makes one free electron in co...

Every atom makes one free electron in copper. If 1.1 ampere current is flowing in the wire of copper having 1 mm diameter, then the drift velocity (approx.) will be (Density of copper `=9 xx 10^(3) kg m^(-3)` and atomic weight = 63)

A

`"0.1 mm s"^(-1)`

B

`"0.2 mm s"^(-1)`

C

`"0.3 mm s"^(-1)`

D

`"0.2 mm s"^(-1)`

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The correct Answer is:
A
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If the density of copper is 8.9xx10^(3)kg//m^(3) , find its relative density.

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Assuming that there is one free electron per atom in copper, determine the number of free electrons in 1 "metre"^(3) volume of copper. Density of copper is 8.9xx10^(3) kgm^(-3) and atomic weight 63.5. (Avogadro's number, N=6.02xx10^(26) per kg-atom).

An electric current of 16 A exists in a metal wire of cross section 10^(-6) m^(2) and length 1 m. Assuming one free electron per atom. The drift speed of the free electrons in the wire will be (Density of metal = 5 xx 10^(3) kg//m^(3) atomic weight = 60)

A current of 4.4A is flowing in a copper wire of radius 1mm density of copper is 9 xx 10^(3)kg m^(-3) and its atoms is 63.5u If every atoms of copper contributes one condition electron , then the drift velocity of electrons is nearly [density of copper 9 xx 10^(3) kg m^(3)]

Calculate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0xx10^(-7)m^(2) , carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0xx10^(3) kg m^(-3) and its atomic mass is 63.5. Take Avogadro's number =6.0xx10^(23) .

Find the time of relation between collision and free path of electrons in copper at room temperature .Given resistance of copper = 1.5xx 10^(-8) Omega m number density of electron in copper = 8.5 xx 10^(28)m^(-3) charge on electron = 1.6 xx 10^(19)C , mass of electrons = 9.1 xx 10^(-19) kg Drift velocity of free electron = 1.6 xx 10^(-4)ms^(-1)

The speed of transverse waves produced in a copper wire is 40 m/s. Calculate the tension developed in the wire if diameter of wire is 1.8 mm and density of wire is 8.9 xx 10^(3) kg m^(-3) .

There are 8.4xx10^(22) free electrons per cm^(3) in copper. The current in the wire is 0.21A (e= 1.6xx10^(-19)C ). Then the drifts velocity of electrns in a copper wire of 1mm^(2) cross section, will be:-

(a) Estimate the average drift speed of conductin electrons in a copper wire of cross sectional area 1.0xx10^(-7) m^2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0xx10^3 kgm^(-3) and its atomic mass is 63.5 u. (b) Compare the drift speed obtained with the speed of propagation of electric field along the conductor, which causes the drift motion.

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