1
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
In the circuit shown,

the switch S1 is closed at time t = 0 and the switch S2 is kept open. At some later time(t0), the switch S1 is opened and S2 is closed. The behavior of the current I as a function of time 't' is given by :
A
B
C
D
2
JEE Main 2019 (Online) 9th January Evening Slot
+4
-1
A power transmission line feeds input power at 2300 V to a srep down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary of the transformer is 5A and its efficiency is 90%, the output current would be :
A
50 A
B
45 A
C
35 A
D
25 A
3
JEE Main 2019 (Online) 9th January Evening Slot
+4
-1
A series AC circuit containing an inductor (20 mH), a capacitor (120 $$\mu$$F) and a resistor (60 $$\Omega$$) is driven by an AC source of 24V/50 Hz. The energy dissipated in the circuit in 60 s is :
A
5.65 $$\times$$ 102J
B
2.26 $$\times$$ 103J
C
5.17 $$\times$$ 102 J
D
3.39 $$\times$$ 103 J
4
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns, giving the output power at 230 V. If the current in the primary of the transformer is 5 A, and its efficiency is 90%, the output current would be ;
A
50 A
B
45 A
C
25 A
D
20 A
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