Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
AP EAMCET2013PhysicsAlternating Current

A series L C R circuit is connected across a source of alternating emf of changing frequency and resonates at frequency f₀ . Keeping capacitance constant, if the inductance (L) is increased by 3 times and resistance is increased (R) by 1.4 times, the resonant frequency now is

Options

  1. A3^ 1 / 4 f₀
  2. B3 f₀
  3. C( 3 -1)^ 1 / 4 f₀
  4. D( 1 3 )^ 1 / 4 f₀

Correct answer

D. ( 1 3 )^ 1 / 4 f₀

Step-by-step solution

We knows in LCR circuits and aligned & f= 1 2 L C & f 1 L aligned Here, in given condition aligned & f₁ f₂ = L₁ L₂ = L 3 L & f₁= ( 1 3 )^ 1 / 4 f₂ & aligned

Practice Alternating Current on Quantrex Academy →

More from Alternating Current

An electronic device operates at 2 MHz. The oscillating circuit has an inductance 20 10⁻⁵ H. What is the capacitive reactance of the resonant circuit? 2026When a current of 2.5 A passes through the primary coil of a transformer of 200 number turns, the magnetic flux linked with the secondary coil having 400 turns is 600 10⁻⁶ T m^2 . 2026In a given circuit, the instantaneous values of the alternating voltage and current are V = 0.5 (80 t + 3 ) volt and I = 0.5 (80 t) ampere respectively. Find the average power cons 2026A source of alternating emf = ₀ ( t) is connected to a capacitor. Then the instantaneous current in the circuit is: 2026If wattless current flows in an AC circuit, then the circuit is: 2026A solenoid having resistance R = 60 and inductance L = 0.4 H is connected to an AC source V = 100 2 200t . Find the maximum current. 2026In a circuit containing a pure resistor connected to an AC source, 2026A light bulb rated 100 W is connected to an AC source of 220 V, 50 Hz. The rms current through the bulb is 2026 Full Alternating Current list All AP EAMCET PYQs