Physics - Current Electricity Question with Solution | TestHub
PhysicsCurrent ElectricityEquivalent ResistanceEasy2 minPYQ_2014
PhysicsEasysingle choice
Assertion: Current is passed through a metallic wire so that it becomes red hot. When cold water is poured on half of its portion, the rest of the half portion becomes more hot. Reason: Resistance decreases due to decrease in temperature.
Options:
Answer:
A
Solution:
The resistance of that half portion of the metallic wire (heated red hot) on which cold water is poured decreases due to fall in its temperature. This results in a decrease in the resistance of the entire wire. As a result, the current in the wire increases and the other half portion becomes hotter than before.
Stream:AIIMSSubject:PhysicsTopic:Current ElectricitySubtopic:Equivalent Resistance
⏱ 2mℹ️ Source: PYQ_2014
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