1
JEE Main 2021 (Online) 25th February Morning Slot
Numerical
+4
-1
A coil of inductance 2 H having negligible resistance is connected to a source of supply whose voltage is given by V = 3t volt. (where t is in second). If the voltage is applied when t = 0, then the energy stored in the coil after 4 s is _______J.
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2
JEE Main 2021 (Online) 25th February Morning Slot
Numerical
+4
-1
A transmitting station releases waves of wavelength 960 m. A capacitor of 2.56 $$\mu$$F is used in the resonant circuit. The self inductance of coil necessary for resonance is __________ $$\times$$ 10$$-$$8 H.
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3
JEE Main 2021 (Online) 24th February Evening Slot
Numerical
+4
-1
A series L-C-R circuit is designed to resonate at an angular frequency $$\omega$$0 = 105 rad/s. The circuit draws 16W power from 120V source at resonance. The value of resistance 'R' in the circuit is _________ $$\Omega$$.
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4
JEE Main 2021 (Online) 24th February Morning Slot
Numerical
+4
-1
A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are ___________.
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