1
JEE Main 2021 (Online) 25th February Morning Shift
+4
-1
The angular frequency of alternating current in a L-C-R circuit is 100 rad/s. The components connected are shown in the figure. Find the value of inductance of the coil and capacity of condenser.

A
0.8 H and 150 $$\mu$$F
B
0.8 H and 250 $$\mu$$F
C
1.33 H and 150 $$\mu$$F
D
1.33 H and 250 $$\mu$$F
2
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
$${{10E} \over {33}},{{5E} \over {18}}$$
3
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
4
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
$${L \over R}\ln \left( {{{\sqrt n - 1} \over {\sqrt n }}} \right)$$
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