An aluminium wire of diameter 0.24 cm is connected in series to a copper wire of diameter 0.16 cm. The wires carry an electric current of 10 ampere. Find (i) current-density in the aluminium wire (ii) drift velocity of electrons in the copper wire. Given : Number of electrons per cubic metre volume of copper `=8.4xx10^(28)`.

A copper wire of diameter 1.6 mm carries a current of 20A. Find the maximum magnitude of the magnetic field (vec B)due to this current.

A copper wire of diameter 1.6 mm carries a current of 20A. Find the maximum magnitude of the magnetic field (vec B) due to this current.

A copper wire has a resistance of 10 Omega and an area of cross-section 1 mm^(2) . A potential difference of 10 V exists across the wire. Calculate the drift speed of electrons if the number of electrons per cubic metre in copper is 8xx10^(28) electrons.

An aluminium wire 7.5 m long is connected in parallel with a copper wire 6 m long. When a current of 5 A is passed through the combination, it is found that the current in the aluminium wire is 3 A . The diameter of the aluminium wire is 1 mm . Determine the diameter of the copper wire. Resistivity of copper is 0.017 muOmega-m and that of the aluminium is 0.028 muOmega-m .

Two different wires X and Y of same diameter but different materials are joined in series across a battery. If the number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires .

A conductor wire having 10^29 free electrons / m^3 carries a current of 20A. If the cross-section of the wire is 1mm^2 , then the drift velocity of electrons will be :

Calculate the drift speed of the electrons when 1A of current exists in a copper wire of cross section 2 mm^(2) .The number of free electrons in 1cm^(3) of copper is 8.5xx10^(22) .

A copper rod of diameter 1 cm and length 8 cm is drawn in to a wire of length 18 m of uniform thickness. Find the thickness of wire.

A copper rod of diameter 1 cm and length 8 cm is drawn into a wire of length 18 m of uniform thickness. Find the thickness of the wire.

A copper rod of diameter 1 cm and length 8 cm is drawn into a wire of length 18 m of uniform thickness. Find the thickness of the wire.