MHT CET 2025 19th April Morning Shift | Alternating Current Question 15 | Physics

The instantaneous value of current in an a.c. circuit is $I=3 \sin \left(50 \pi t+\frac{\pi}{4}\right) \mathrm{A}$. The current will be maximum for the first time at

$\frac{1}{50} \mathrm{~s}$

$\frac{1}{100} \mathrm{~s}$

$\frac{1}{200} \mathrm{~s}$

$\frac{1}{600} \mathrm{~s}$

MHT CET 2024 16th May Evening Shift

MCQ (Single Correct Answer)

-0

An inductance of 2 mH , a condenser of $20 \mu \mathrm{~F}$ and a resistance of $50 \Omega$ are connected in series to an a.c. source. The reactance of inductor and condenser are same. The reactance of either of them will be

$100 \Omega$

$50 \Omega$

$40 \Omega$

$10 \Omega$

MHT CET 2024 16th May Evening Shift

MCQ (Single Correct Answer)

-0

In an $L C R$ circuit, if ' $V$ ' is the effective value of the applied voltage, $V_R$ is the voltage across ' $R$ ', ' $\mathrm{V}_{\mathrm{L}}$ ' and ' $\mathrm{V}_{\mathrm{C}}$ ' is the effective voltage across ' L ' and ' $C$ ' respectively then

$\mathrm{V}=\mathrm{V}_{\mathrm{R}}+\mathrm{V}_{\mathrm{L}}+\mathrm{V}_{\mathrm{C}}$

$\mathrm{V}^2=\mathrm{V}_{\mathrm{R}}^2+\mathrm{V}_{\mathrm{L}}^2+\mathrm{V}_{\mathrm{C}}^2$

$\mathrm{V}^2=\mathrm{V}_{\mathrm{R}}^2+\left(\mathrm{V}_{\mathrm{L}}-\mathrm{V}_{\mathrm{c}}\right)^2$

$\mathrm{V}^2=\mathrm{V}_{\mathrm{L}}^2+\left(\mathrm{V}_{\mathrm{R}}-\mathrm{V}_{\mathrm{C}}\right)^2$

MHT CET 2024 16th May Evening Shift

MCQ (Single Correct Answer)

-0

A light bulb connected in series with a capacitor and an a.c. source is glowing with a certain brightness. On reducing the capacity of capacitance and frequency of source, the brightness of the lamp (respectively)

is reduced, is increased

is reduced, is reduced

is increased, is reduced

is increased, is increased

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