At room temperature, copper has free ele...

At room temperature, copper has free electron density of `8.4xx10^(28)"m"^(-3)`. The electron drift velocity in a copper conductor of cross - sectional area `10^(-6)m^(2)` and carrying a current of 5.4A, will be -

`4ms^(-1)`

`0.4ms^(-1)`

`4cms^(-1)`

`0.4mms^(-1)`

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At room temperature copper has free electron density of 8.4xx10^(28) per m^(3) . The copper conductor has a cross-section of 10^(-6)m^(2) and carries a current of 5.4 A. What is the electron drift velocity in copper?

What is the magnetic moment associated with a coil of 1 turn, area of cross-section 10^(-4)m^(2) carrying a current of 2A?

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In a metal in the solid state, such as a copper wire, the atoms are strongly bound to one another and occupý fixed positions. Some electrons (called the conductor electrons) are free to move in the body of the metal while the other are strongly bound to their atoms. In good conductors, the number of free electrons is very large of the order of 10^(28) electrons per cubic metre in copper. The free electrons are in random motion and keep colliding with atoms. At room temperature, they move with velocities of the order of 10^5 m/s. These velocities are completely random and there is not net flow of charge in any directions. If a potential difference is maintained between the ends of the metal wire (by connecting it across a battery), an electric field is set up which accelerates the free electrons: These accelerated electrons frequently collide with the atoms of the conductor, as a result, they acquire a constant speed called the drift speed which is given by V_e = 1/enA where I = current in the conductor due to drifting electrons, e = charge of electron, n = number of free electrons per unit volume of the conductor and A = area of cross-section of the conductor. A uniform wire of length 2.0 m and cross-sectional area 10^(-7) m^(2) carries a current of 1.6 A. If there are 10^(28) free electrons per m in copper, the drift speed of electrons in copper is

If 10^(6) electrons/s are flowing through an area of cross section of 10^(-4) m^(2) then the current will be:-

Estimate the average drift velocity of conduction electrons in a copper wire of cross-sectional area 2.5 xx 10^(-7) m^(2) , carrying a current of 2.7 A. Assume the density of conduction electrons to be 9 xx 10^(28) m^(-3) .

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 2.5xx10^(-7)m_(2) carrying current of 1.8 A. Assume the density of conduction electrons to be 9xx 10^(26)m_(3) .

A closely wound solenoid of 750 turns and area of cross section of 5xx 10^(4)m^(2) carries a current of 3.0 A. Its associated magnetic moment is

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.

A ciruclar coil of 20 turns and radius 10cm is placed in a uniform magnetic field of 0.1T normal to the plane of the coil . If the current in the coil is 5.0A what is the average force on each electron in the coil due to the magnetic field ( The coil is made of copper wire of cross - sectional area 10^(-5)m^(2) and the free electron density in copper is given to be about 10^(29)m^(-3)) .

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