JEE Main 2026 — Alternating Current Question with Solution
JEE Main 2026 (05 April Shift 1)
Question
An a.c. source of angular frequency is connected across a resistor and a capacitor in series. The current is observed as . Now the frequency of the source is changed to , (keeping the voltage unchanged) the current is found to be . The ratio of resistance to reactance at frequency is
Choose an option
Show full solutionCorrect option: C
Correct answer
C
Step-by-step explanation
The current in the RC circuit at frequency is given by
where is the capacitive reactance.
When the frequency is changed to , the new reactance becomes .
The new current is given as , so
Substituting the expression for , we get
Squaring both sides, we obtain
Answer:
where is the capacitive reactance.
When the frequency is changed to , the new reactance becomes .
The new current is given as , so
Substituting the expression for , we get
Squaring both sides, we obtain
Answer:
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This is a previous-year question from JEE Main 2026, covering the Alternating Current 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.