1
JEE Main 2021 (Online) 27th August Evening Shift
Numerical
+4
-1
An ac circuit has an inductor and a resistor resistance R in series, such that XL = 3R. Now, a capacitor is added in series such that XC = 2R. The ratio of new power factor with the old power factor of the circuit is $$\sqrt 5 :x$$. The value of x is ___________.
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2
JEE Main 2021 (Online) 27th August Morning Shift
Numerical
+4
-1
The alternating current is given by $$i = \left\{ {\sqrt {42} \sin \left( {{{2\pi } \over T}t} \right) + 10} \right\}A$$

The r.m.s. value of of this current is ................. A.
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3
JEE Main 2021 (Online) 27th July Evening Shift
Numerical
+4
-1
In the given figure the magnetic flux through the loop increases according to the relation $$\phi$$B(t) = 10t2 + 20t, where $$\phi$$B is in milliwebers and t is in seconds.

The magnitude of current through R = 2$$\Omega$$ resistor at t = 5 s is ___________ mA.

JEE Main 2021 (Online) 27th July Evening Shift Physics - Alternating Current and Electromagnetic Induction Question 98 English
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4
JEE Main 2021 (Online) 27th July Morning Shift
Numerical
+4
-1
Consider an electrical circuit containing a two way switch 'S'. Initially S is open and then T1 is connected to T2. As the current in R = 6$$\Omega$$ attains a maximum value of steady state level, T1 is disconnected from T2 and immediately connected to T3. Potential drop across r = 3$$\Omega$$ resistor immediately after T1 is connected to T3 is __________ V. (Round off to the Nearest Integer)

JEE Main 2021 (Online) 27th July Morning Shift Physics - Alternating Current and Electromagnetic Induction Question 99 English
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