JEE Main 2007 — Current Electricity Question with Solution
From: AIEEE 2007
Question
The resistance of a wire is ohm at and ohm at The resistance of the wire at will be
Choose an option
Show full solutionCorrect option: D
Correct answer
D ohm
Step-by-step explanation
KEY CONCEPT : We know that
where is the resistance of the wire at
is the resistance of the wire at
and is the temperature coefficient of resistance
From
From
Dividing by we get
Here, and
or,
or,
where is the resistance of the wire at
is the resistance of the wire at
and is the temperature coefficient of resistance
From
From
Dividing by we get
Here, and
or,
or,
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This is a previous-year question from JEE Main 2007, 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.