1
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
The time taken for the magnetic energy to reach 25% of its maximum value, when a solenoid of resistance R, inductance L is connected to a battery, is :
2
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
In a series LCR resonance circuit, if we change the resistance only, from a lower to higher value :
3
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
An AC source rated 220 V, 50 Hz is connected to a resistor. The time taken by the current to change from its maximum to the rms value is :
4
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II
Choose the most appropriate answer from the options given below :
List - I | List - II | ||
---|---|---|---|
(a) | Phase difference between current and voltage in a purely resistive AC circuit | (i) | $${\pi \over 2}$$; current leads voltage |
(b) | Phase difference between current and voltage in a pure inductive AC circuit | (ii) | zero |
(c) | Phase difference between current and voltage in a pure capacitive AC circuit | (iii) | $${\pi \over 2}$$; current lags voltage |
(d) | Phase difference between current and voltage in an LCR series circuit | (iv) | $${\tan ^{ - 1}}\left( {{{{X_C} - {X_L}} \over R}} \right)$$ |
Choose the most appropriate answer from the options given below :
Questions Asked from Alternating Current and Electromagnetic Induction (MCQ (Single Correct Answer))
Number in Brackets after Paper Indicates No. of Questions
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