List of top Physics Questions on Alternating current asked in MHT CET

A resistor of 5 $\Omega$, inductor of self inductance $\left(\frac{2}{\pi}\right)$ H and a capacitor of unknown capacity are connected in series to an a.c. source of 100 V, 50 Hz supply. When the voltage and current are in phase, the value of capacitance is ______.
L, C and R are connected in series to an a.c. source. Which one of the following is true? Phase relation between current and voltage is such that ______.
In an LC circuit, the inductance \( L \) is \( 2 \, \text{H} \) and the capacitance \( C \) is \( 4 \, \mu\text{F} \). What is the frequency of oscillation of the circuit?
The gravitational pull of the moon is $(\frac{1}{6})^{th}$ of the earth and mass of moon is $(\frac{1}{8})^{th}$ of the earth. This implies that the
In Young's double slit experiment, the light of wavelength '$\lambda$' is used. The intensity at a point on the screen is 'I' where the path difference is $\lambda/4$. If '$I_0$' denotes the maximum intensity then the ratio of '$I_0$' to 'I' is ($\cos 45^\circ = 1/\sqrt{2}$)
In the case of constant ' \(\alpha\) ' and ' \(\beta\) ' of a transistor ( \(\alpha\) and \(\beta\) are current ratios)
If '\(\lambda_1\)' and '\(\lambda_2\)' are the wavelengths of the first member of the Balmer and Paschen series, in hydrogen atom respectively, then the ratio of respective frequencies, \(f_1/f_2\) , is
When a capacitor is connected in series LR circuit, the alternating current flowing in the circuit}
The de-Broglie wavelength of a neutron at \( 27^\circ\text{C} \) is ' \( \lambda_0 \) '. What will be its wavelength at \( 927^\circ\text{C} \)?
An AC voltage \( V = 50\sqrt{2} \sin(100t) \) is applied across a capacitor of capacitance \( C = 1 \mu F \). What is the rms value of the current through the capacitor?
Given the voltage equation \( V = 100 \sqrt{2} \sin(\omega t) \) and capacitance \( C = 2 \, \mu \text{F} \), calculate the RMS current.
A series LCR circuit is subjected to an AC signal of \( 200 \, \text{V}, 50 \, \text{Hz} \). If the voltage across the inductor (\( L = 10 \, \text{mH} \)) is \( 31.4 \, \text{V} \), then the current in this circuit is:
In an a.c. circuit, voltage and current are given by: \[ V = 100 \sin(100t) \, \text{V} \quad \text{and} \quad I = 100 \sin\left(100t + \frac{\pi}{3}\right) \, \text{mA}. \] The average power dissipated in one cycle is:

In LCR series resonance circuit, choose the wrong statement

A condenser of capacity ‘C’ is charged to a potential difference of ‘V1’. The plates of the condenser are then connected to an ideal inductor of inductance ‘L’. The current through an inductor when the potential difference across the condenser reduces to ‘V2’ is

If we increase the frequency of an a.c. supply, then inductive reactance
The peak value of an alternating emf $e$ given by $e = e_0 \cos \omega t$ is $10\text{ V}$ and its frequency is $50\text{ Hz}$. At time $t = \frac{1}{600}\text{ s}$, the instantaneous e.m.f is $\left[\cos \frac{\pi}{6} = \sin \frac{\pi}{3} = \frac{\sqrt{3}}{2}\right]$
In series LCR circuit, resistance is 18 \( \Omega \) and impedance is 33 \( \Omega \). An r.m.s. voltage of 220 V is applied across the circuit. The true power consumed in a.c. circuit is
An alternating current of frequency 50 Hz has the peak value as 14.14 A. The time taken by the alternating current in reaching from zero to maximum value and r.m.s. value of current will be respectively
Assuming the earth to be a sphere of uniform density, the ratio of acceleration due to gravity on the earth's surface to its value at halfway towards the centre of the earth, will be
A stone of mass \(2\,\text{kg}\) attached at one end of a \(2\,\text{m}\) long string is whirled in a horizontal circle. The string makes an angle of \(45^\circ\) with the vertical. Then the centripetal force acting on the stone is (\(g = 10\,\text{m s}^{-2}\), \(\tan 45^\circ = 1\))
A sonometer wire of length \(l_1\) is in resonance with a frequency 250 Hz. If the length of wire is increased to \(l_2\), then 2 beats per second are heard. The ratio of lengths \( \dfrac{l_1}{l_2} \) of wire will be
In the differential equation of linear simple harmonic motion \(\displaystyle \frac{d^2x}{dt^2} + \omega^2 x = 0\), the term \( \omega^2 \) represents
In a series LCR circuit at resonance, the applied e.m.f. of the source and current in the circuit are:
The phase difference between the voltage and the current in an a.c. circuit is \( \frac{\pi}{4} \). If the frequency is 50 Hz, then the phase difference is equivalent to a time of: