JEE Main 2018 — Current Electricity Question with Solution
JEE Main 2018 (15 Apr Shift 2 Online)
Question
A constant voltage is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be:
Choose an option
Show full solutionCorrect option: A
Correct answer
AIncreased 8 times
Step-by-step explanation
Rate of heat i.e., Power developed in the
Resistance of the wire of length,
Power,
Resistance of the wire when length is halved i.e.,
Power,
or, i.e., power increased 8 times of previous or original wire.
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This is a previous-year question from JEE Main 2018, covering the Current Electricity chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.