1
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
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
Change Language
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
JEE Main 2016 (Online) 9th April Morning Slot Physics - Alternating Current Question 152 English Option 1
B
JEE Main 2016 (Online) 9th April Morning Slot Physics - Alternating Current Question 152 English Option 2
C
JEE Main 2016 (Online) 9th April Morning Slot Physics - Alternating Current Question 152 English Option 3
D
JEE Main 2016 (Online) 9th April Morning Slot Physics - Alternating Current Question 152 English Option 4
3
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Change Language
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
Change Language
An inductor $$(L=0.03$$ $$H)$$ and a resistor $$\left( {R = 0.15\,k\Omega } \right)$$ are connected in series to a battery of $$15V$$ $$EMF$$ in a circuit shown below. The key $${K_1}$$ has been kept closed for a long time. Then at $$t=0$$, $${K_1}$$ is opened and key $${K_2}$$ is closed simultaneously. At $$t=1$$ $$ms,$$ the current in the circuit will be : $$\left( {{e^5} \cong 150} \right)$$

JEE Main 2015 (Offline) Physics - Alternating Current Question 159 English
A
$$6.7$$ $$mA$$
B
$$0.67$$ $$mA$$
C
$$100$$ $$mA$$
D
$$67$$ $$mA$$
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