Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
99 Percentile Qs Bank for JEE MainPhysicsAlternating Current

In the following circuit an AC input V_i(t)=(20 mV ) (10^5 t ) is applied at the left end. The amplitude of the output voltage V₀ at the right end across the capacitor will be

Options

  1. A14.14 mV
  2. B10.55 mV
  3. C20.2 mV
  4. D25.55 mV

Correct answer

A. 14.14 mV

Step-by-step solution

Given that, input AC voltage, Comparing Eqs. (i) and (ii), we get =10^5 rad / s , V_ =20 mV =20 10⁻³ ~V The V_i is distributed across R and C . by V_R and V_C , as phasor diagram. Reactance of capacitor, X_C= 1 C = 1 10^5 10⁻⁸ =10^3 =1000 Now, impedance of R - C series circuit. Z= R^2+X_C^2 = (1000)^2+(1000)^2 =1000 2 Now, voltage across capacitor, aligned V_C & =V₀= X_C Z V_ = 1000 1000 2 20 mV & = 2 10 mV & =14.14 mV 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 99 Percentile Qs Bank for JEE Main PYQs