Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Most Important Selected Qs for JEE AdvancedPhysicsAlternating Current

Paragraph: A circuit shown in the figure in which k ₁ is closed and k ₂ is open. Inductor L can be connected to capacitor C ₁ by closing switch k ₂ and opening k ₁ . Question: The maximum energy across inductor will be

Options

  1. A0.144 mJ
  2. B0.288 mJ
  3. C0.072 mJ
  4. DNone of these

Correct answer

A. 0.144 mJ

Step-by-step solution

For long time capacitor gets full charged and charge on each capacitor must be same. aligned & Q 2 + Q 3 =20 & Q =24 C & [ = 1 LC = 1 2 2 10⁻⁶ = 10 2 =50 rad / s ] & Q ( t )=24 t C & Q ( t )=(24 t ) C & 500 t = 2 (-1)^ n + n & t = n 500 +(-1)^ n 1000 & E _ = Q ₀^2 2 C = 24 10⁻³ 24 10⁻⁶ 2 2 10⁻⁶ =144 10⁻⁶ Joule =0.144 ~mJ aligned

Practice Alternating Current on Quantrex Academy →

More from Alternating Current

Consider a circuit consisting of a capacitor of capacitance C and a coil with N turns per unit length, cross sectional area S and length d , where d^2 S . There is another coil of 2026An LCR series circuit driven with E_ rms = 90 V at frequency f_d = 30 Hz has resistance R = 80 , , an inductance with inductive reactance X_L = 20.0 , and capacitance with capacitiv 2026A series LCR circuit with R = 20 , L = 1.6 H and C = 40 F is connected to a variable frequency a.c. source. The inductive reactance at resonant frequency is _______ . 2026An a.c. source of angular frequency is connected across a resistor R and a capacitor C in series. The current is observed as I . Now the frequency of the source is changed to /4 , 2026An inductor of 10 mH, capacitor of 0.1 F and a resistor of 100 are connected in series across an a.c power supply 220 V, 70 Hz. The power factor of the given circuit is 0.5 . The d 2026The figure given below shows an LCR series circuit with two switches S₁ and S₂ . When switch S₁ is closed keeping S₂ open, the phase difference ( ) between the current and source v 2026An inductor stores 16 J of magnetic field energy and dissipates 32 W of thermal energy due to its resistance when an a.c. current of 2 A (rms) and frequency 50 Hz flows through it. 2026The electric current in the circuit is given as i=i_ o (t / T) . The r.m.s current for the period t=0 to t=T is _ _ _ _ . 2026 Full Alternating Current list All Most Important Selected Qs for JEE Advanced PYQs