An iron wire rheostat, a milliammeter and an EMF source are connected in series. At a temperature of 0°C, the resistance of the rheostat is 200 Ohms, and the resistance of the milliammeter is 20 Ohms. The milliammeter shows 30 mA. What will the milliammeter reading be if the rheostat heats up to 50°C? Neglect the internal resistance of the source.
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