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Alternating Current

JEE Main 2025 (Online) 23rd January Evening ShiftNumericalEasy📈 Topic in 11% papers+4
Ques. 1JEE Main 2025, 23 January (Evening Shift)

In a series LCR circuit, a resistor of 300 , a capacitor of 25 nF and an inductor of 100 mH are used. For maximum current in the circuit, the angular frequency of the ac source is 104 radians s-1

Answer

2

Solution

Current is maximum at resonance, XL=XC (the value of R does not matter).

[figure]

0= 1 LC= 1 0.1 25 10-9= 15 10-5=2 104 rad s-1

Answer: 2

Keep practising — Alternating Current

Ques. 2JEE Main 2025, 22 January (Evening Shift)

A series LCR circuit is connected to an alternating source of emf E. The current amplitude at resonant frequency is I0. If the value of resistance R becomes twice of its initial value then amplitude of current at resonance will be

  1. I02
  2. I0 2
  3. 2I0
  4. I0

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