1
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A sinusoidal voltage of peak value 283 V and angular frequency 320/s is applied to a series LCR circuit. Given that R=5 $$\Omega$$, L=25 mH and C=1000 $$\mu$$F. The total impedance, and phase difference between the voltage across the source and the current will respectively be :
A
10 $$\Omega$$ and tan$$-$$1 $$\left( {{5 \over 3}} \right)$$
B
$$7\,\Omega$$ and 45o
C
$$10\,\Omega$$ and tan$$-$$1$$\left( {{8 \over 3}} \right)$$
D
$$7\,\Omega$$ and tan$$-$$1$$\left( {{5 \over 3}} \right)$$
2
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
A series LR circuit is connected to a voltage source with
V(t) = V0 sin$$\Omega$$t. After very large time, current I(t) behaves as
(t0 >> $${L \over R}$$) :
A
B
C
D
3
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
An arc lamp requires a direct current of 10 A at 80 V to function. If it is connected to a 220 V (rms), 50 Hz AC supply, the series inductor needed for it to work is close to :
A
0.044 H
B
0.065 H
C
80 H
D
0.08 H
4
JEE Main 2015 (Offline)
MCQ (Single Correct Answer)
+4
-1

An $$LCR$$ circuit is equivalent to a damped pendulum. In an $$LCR$$ circuit the capacitor is charged to $${Q_0}$$ and then connected to the $$L$$ and $$R$$ as shown below :

If a student plots graphs of the square of maximum charge $$\left( {Q_{Max}^2} \right)$$ on the capacitor with time$$(t)$$ for two different values $${L_1}$$ and $${L_2}$$ $$\left( {{L_1} > {L_2}} \right)$$ of $$L$$ then which of the following represents this graph correctly ?
$$\left( {plots\,\,are\,\,schematic\,\,and\,\,niot\,\,drawn\,\,to\,\,scale} \right)$$

A
B
C
D
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