The number density of free electrons in a copper conductor is estimated as `8.5xx10^(28)m^(-3)`. How long does an electron take to drift from one end of a wire 3.0m long to its other end? The area of cross-section of the wire is `2.0xx 10^(-6)m^(2)` and it is carrying a current of 3.0A.

What is the magnetic moment associated with a current loop of area 2 xx 10^(-3) m^2 and carrying current of 0.5A?

The number density of free electrons in the semiconductor is 10^18 m^-3. It is doped with a pentavalent impurity atoms of number density 10^24 m^-3 . The number density of free electrons m^-3 increases by a factor of

The number densities of electrons and holes in pure silicon are 1.5 xx 10^16m^-3 . On doping with indium, the hole density becomes 4.5 xx 10^22 m^-3 , the electron density is

A copper wire has 3xx 10^(22) free electrons in 0.021 m length. The drift velocity of electrons is found to be 2xx10^(-5)ms^(-1) . How many electrons would pass through a given cross-section of the wire in one second?

Calculate the resistance of a metal wire of length 2 m and area of cross section 1·55 xx 10^(-6) m^(2) , if the resistivity of the metal be 2·8 xx 10^(-8) Omega m ?

Calculate the resistance of a 1 Km long copper wire of area of cross section 2 xx 10^(-2) cm^(2) . The resistivity of copper is 1.623 xx 10^(-8) ohm-meter.

If the number density of electrons in a conductor is 3 xx10^(28) and thickness of the conductor is 5 mm, then calculate the current in that conductor for a drift velocity of 2 xx 10^(-4) ms^(-1) . If the voltage applied is 500 V , then calculate relaxation time. Given specific charge of electron = 1.76xx 10^(11) C kg^(-1) , length of the conductor = 10 m