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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > According to stefan’s law of radiation a black body radiates energy σT^4 from is unit surface area every second where T is the surface temperature of the black body and σ=5.67×10^−8W/m^2K^4 is known as Stefan’s of as a ball of radius 0.5m When detonated it reaches temperature of 106K and can be treated as a black body Estimate the power it radiates .

According to stefan’s law of radiation a black body radiates energy σT^4 from is unit surface area every second where T is the surface temperature of the black body and σ=5.67×10^−8W/m^2K^4 is known as Stefan’s of as a ball of radius 0.5m When detonated it reaches temperature of 106K and can be treated as a black body Estimate the power it radiates .

A 2m long wire of resistance 4 ohm and diameter 0.64 mm is coated with plastic insulation of thickness 0.06 mm. When a current of 5 A flows through the wire find the temperature difference across the insulation in steady state.