JEE Main 202522 JanuaryEvening Shift
- Exam
- JEE Main
- Year
- 2025
- Date
- 22 January
- Shift
- Evening Shift
- Subject
- Physics
- Chapter
- Alternating Current
JEE Main 2025 · 22 January · Evening Shift · Physics · Alternating Current
A series LCR circuit is connected to an alternating source of emf...
A series LCR circuit is connected to an alternating source of emf E. The current amplitude at resonant frequency is . If the value of resistance R becomes twice of its initial value then amplitude of current at resonance will be
Options
- A\mathrm{I}
- B
- C\frac{\mathrm{I}_0}{2}
- D\frac{\mathrm{I}_0}{\sqrt{2}}
Correct answer
C. \frac{\mathrm{I}_0}{2}
Step-by-step solution
Initially,
Finally, \mathrm{I}_0^1=\frac{\varepsilon_{\mathrm{m}}}{2 \mathrm{R}}=\frac{\mathrm{I}_0}{2}