1
JEE Main 2021 (Online) 25th February Morning Shift
+4
-1
The current (i) at time t = 0 and t = $$\infty$$ respectively for the given circuit is :

A
$${{18E} \over {55}},{{5E} \over {18}}$$
B
$${{5E} \over {18}},{{18E} \over {55}}$$
C
$${{5E} \over {18}},{{10E} \over {33}}$$
D
$${{10E} \over {33}},{{5E} \over {18}}$$
2
JEE Main 2020 (Online) 6th September Morning Slot
+4
-1
Out of Syllabus
An AC circuit has R= 100 $$\Omega$$, C = 2 $$\mu$$F and L = 80 mH, connected in series. The quality factor of the circuit is :
A
20
B
2
C
0.5
D
400
3
JEE Main 2020 (Online) 4th September Evening Slot
+4
-1
A series L-R circuit is connected to a battery of emf V. If the circuit is switched on at t = 0, then the time at which the energy stored in the inductor reaches $$\left( {{1 \over n}} \right)$$ times of its maximum value, is :
A
$${L \over R}\ln \left( {{{\sqrt n } \over {\sqrt n + 1}}} \right)$$
B
$${L \over R}\ln \left( {{{\sqrt n } \over {\sqrt n - 1}}} \right)$$
C
$${L \over R}\ln \left( {{{\sqrt n + 1} \over {\sqrt n - 1}}} \right)$$
D
$${L \over R}\ln \left( {{{\sqrt n - 1} \over {\sqrt n }}} \right)$$
4
JEE Main 2020 (Online) 3rd September Morning Slot
+4
-1
A 750 Hz, 20 V (rms) source is connected to a resistance of 100 $$\Omega$$, an inductance of 0.1803 H and a capacitance of 10 $$\mu$$F all in series. The time in which the resistance (heat capacity 2 J/oC) will get heated by 10oC. (assume no loss of heat to the surroudnings) is close to :
A
348 s
B
418 s
C
245 s
D
365 s
EXAM MAP
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