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The coil of a relay takes a current of 0.12 A when it is at the room temperature of 15° C and connected across a 60 V supply. If the minimum operating current of the relay is 0.1 A, calculate the temperature above which the relay will fail to operate when connected to the same supply. Resistance-temperature coefficient of the coil material is 0.0043 per °C at 6 °C.
Sagot :
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