MHT CET 2025 23rd April Evening Shift | Alternating Current Question 1 | Physics

If the power factor changes from 0.5 to 0.25 because impedance changes from $Z_1$ to $Z_2$ then $\mathrm{Z}_1=\mathrm{xZ}_2$. The value of x is (Resistance remains constant)

0.1

0.5

0.7

0.4

MHT CET 2025 23rd April Evening Shift

MCQ (Single Correct Answer)

-0

Same current is flowing in two different a.c. circuits. First circuit contains only inductance and second contains only capacitance. If the frequency of a.c. is increased in both circuits, the current will

increase in the first circuit and decrease in second.

increase in both circuits.

decrease in both circuits.

decrease in first circuit and increase in second.

MHT CET 2025 23rd April Morning Shift

MCQ (Single Correct Answer)

-0

An a. c. source is connected across a pure inductor. Which one of the following figures shows the correct phase relation between the current and e.m.f.?

MHT CET 2025 23rd April Morning Shift

MCQ (Single Correct Answer)

-0

In an a.c. circuit with pure capacitance ' C ' and a.c. source $E=E_0 \sin \omega t$, the equation of instantaneous current is given by

$\mathrm{I}=\mathrm{E}_0 \omega \mathrm{c} \sin (\omega \mathrm{t})$

$I=E_0 \omega c \sin \left(\omega t+\frac{\pi}{2}\right)$

$\mathrm{I}=\frac{\mathrm{E}_0}{\omega \mathrm{c}} \sin (\omega \mathrm{t})$

$\mathrm{I}=\frac{\mathrm{E}_0}{\omega \mathrm{c}} \sin \left(\omega \mathrm{t}+\frac{\pi}{2}\right)$

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