MHT CET 2025 25th April Evening Shift | Alternating Current Question 9 | Physics

An a.c. source of frequency ' f ' is connected to a circuit containing an inductance ' $L$ ' and resistance ' R ' in series. The impedance of this circuit is

$\sqrt{\mathrm{R}^2+2 \pi \mathrm{fL}^2}$

$\sqrt{\mathrm{R}^2+\mathrm{L}^2}$

$\mathrm{R}+2 \pi \mathrm{fL}$

$\sqrt{\mathrm{R}^2+4 \pi^2 \mathrm{f}^2 \mathrm{~L}^2}$

MHT CET 2025 25th April Morning Shift

MCQ (Single Correct Answer)

-0

The reactance of a capacitor is $\mathrm{X}_{\mathrm{C}}$. If the frequency and the capacitance are doubled, then the new reactance will be

$\frac{X_C}{2}$

$\mathrm{X}_{\mathrm{C}}$

$\frac{X_C}{4}$

$2 X_C$

MHT CET 2025 25th April Morning Shift

MCQ (Single Correct Answer)

-0

An a. c. voltage is applied to pure inductor. The current in the inductor

leads the voltage by $\left(\frac{\pi}{4}\right)^c$

leads the voltage by $\left(\frac{\pi}{2}\right)^c$

lags behind the voltage by $\left(\frac{\pi}{2}\right)^c$

lags behind the voltage by $\left(\frac{3 \pi}{4}\right)^c$

MHT CET 2025 25th April Morning Shift

MCQ (Single Correct Answer)

-0

The power factor of a CR circuit is $\frac{1}{\sqrt{2}}$, If the frequency of a.c. signal is halved, then the power factor of the circuit will become

$\frac{1}{\sqrt{3}}$

$\frac{1}{\sqrt{5}}$

$\frac{1}{\sqrt{7}}$

$\frac{1}{\sqrt{11}}$

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