40 JEE Main 2021 Alternating Current previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2021 previous-year questions from the Alternating Current chapter of Physics. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Alternating Current chapter hub.
An A C source rated 220   V , 50   Hz is connected to a resistor. The time taken by the current to change fro…
A transmitting station releases waves of wavelength 960   m . A capacitor of 2 . 56   μ F is used in the…
For a series LCR circuit with R = 100   Ω ,   L = 0 . 5   mH and C = 0 . 1   pF connected acro…
The figure shows a circuit that contains four identical resistors with resistance R = 2 . 0   Ω , two identic…
A 100 Ω resistance, a 0 . 1 μ F capacitor and an inductor are connected in series across a 250   V suppl…
An alternating current is given by the equation i = i 1 sin ω t + i 2 cos ω t . The rms current will be:
An A C current is given by I = I 1 s i n ω t + I 2 c o s ω t . A hot wire ammeter will give a reading:
The time taken for the magnetic energy to reach 25 % of its maximum value, when a solenoid of resistance R , inductance…
In a series LCR resonant circuit, the quality factor is measured as 100 . If the inductance is increased by two fold an…
At very high frequencies, the effective impedance of the given circuit will be _________ Ω .
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