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प्रश्न
Which one is a non-ohmic resistance?
विकल्प
constantan wire
electric bell
coil of heater
eureka wire
MCQ
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उत्तर
Electric bell
Explanation:
An electric bell contains an electromagnet, which is a non-ohmic device because it does not obey Ohm's law. Constantan wire and eureka wire are alloys whose resistance remains almost constant, so they are ohmic. A heater coil is made of a metallic alloy and behaves as an ohmic resistor at constant temperature.
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