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A coil copper wire has a resistance of 90Ω at 20° and is connected to a 230V supply. By how much must the voltage be increased to keep the current constant, if the temperature of the coil rises to 60°C? Take the temperature coefficient of resistance of copper is 0.004 28Ω/Ω at 0°C/°C.

Home/ College/A coil copper wire has a resistance of 90Ω at 20° and is connected to a 230V supply. By how much must the voltage be increased to keep the current constant, if the temperature of the coil rises to 60°C? Take the temperature coefficient of resistance of copper is 0.004 28Ω/Ω at 0°C/°C.