A wire of length 1 m and radius `10^-3`m is carrying a heavy current and is assumed to radiate as a black body. At equilibrium, its temperature is 900 K while that of surrounding is 300 K. The resistivity of the material of the wire at 300 K is `pi^@xx10^-8` ohm m and its temperature coefficient of resistance is `7.8xx10^(-3)//C` (stefan's constant`sigma=5.68xx10^-8W//m^(2) K^(2)`.
The current in the wire is nearly

A wire of length 1 m and radius 10^-3 m is carrying a heavy current and is assumed to radiate as a black body. At equilibrium, its temperature is 900 K while that of surrounding is 300 K. The resistivity of the material of the wire at 300 K is pi^@xx10^-8 ohm m and its temperature coefficient of resistance is 7.8xx10^(-3)//C (stefan's constant sigma=5.68xx10^-8W//m^(2) K^(2) . Heat radiated per second by the wire is nearly

A wire of length 1 m and radius 10^-3 m is carrying a heavy current and is assumed to radiate as a black body. At equilibrium, its temperature is 900 K while that of surrounding is 300 K. The resistivity of the material of the wire at 300 K is pi^@xx10^-8 ohm m and its temperature coefficient of resistance is 7.8xx10^(-3)//C (stefan's constant sigma=5.68xx10^-8W//m^(2) K^(4) ). Q. The resistivity of wire at 900 K is nearly

What is the length of a wire of radius 0.2 mm and resitance 25 Omega ? The restivity of the material of the wire is 2pi xx 10^(-8) Omega.m.

Length of a hollow tube is 5 m , its over diamter is 10 cm and thickness of its wall is 5 mm. If resistivity of the material of the tube is 1.7 xx 10^(-8) Omega xx m then resistance of tube will be

The susceptibility of magnesium at 300 K is 1.2 xx 10^(-5) . At what temperature will the susceptibility increase to 1.8 xx 10^(-5) ?

Calcualte the resistance of a steel wire of length 10m and diameter 0.6mm at 0^(@)C and 100^(@)C . (Electrical resistivity of steel 0^(@)C is 15 xx 10^(-8)Omega m and mean temperature coefficient of resistance of steel is 50 xx 10i^(-4)K^(-1)

A wire has a resistance of 2.1 Omega at 300 K and a resistance of 2.7 Omega at 373 K. Determine the temperature coefficent of resistance of the material.

The temperature coefficient of resistance of a wire is 0.00125 per ^@C . At 300K, its resistance is 1 ohm. This resistance of the wire will be 2 ohm at.