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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A common flashlight bulb is rated 0.30 A and 2.7 V (the values of the current and voltage under operating conditions.) If the resistance of the tungsten bulb filament at room temperature 20∘ C is 1.0 Ω and its temperature coefficient of resistivity is 4.0 × 10^−3 C^−1, then find the temperature in centigrade of the filament when the bulb is on. (Consider the variation of resistance to be linear with temperature.)

A common flashlight bulb is rated 0.30 A and 2.7 V (the values of the current and voltage under operating conditions.) If the resistance of the tungsten bulb filament at room temperature 20∘ C is 1.0 Ω and its temperature coefficient of resistivity is 4.0 × 10^−3 C^−1, then find the temperature in centigrade of the filament when the bulb is on. (Consider the variation of resistance to be linear with temperature.)

A steady current flows in a metallic conductor of non- uniform cross - section. The quantity constant along the length of the conductor is /are