1
JEE Main 2022 (Online) 30th June Morning Shift
+4
-1

In series RLC resonator, if the self inductance and capacitance become double, the new resonant frequency (f2) and new quality factor (Q2) will be :

(f1 = original resonant frequency, Q1 = original quality factor)

A
$${f_2} = {{{f_1}} \over 2}$$ and $${Q_2} = {Q_1}$$
B
$${f_2} = {f_1}$$ and $${Q_2} = {{{Q_1}} \over {{Q_2}}}$$
C
$${f_2} = 2{f_1}$$ and $${Q_2} = {Q_1}$$
D
$${f_2} = {f_1}$$ and $${Q_2} = 2{Q_1}$$
2
JEE Main 2022 (Online) 29th June Morning Shift
+4
-1

For a series LCR circuit, I vs $$\omega$$ curve is shown :

(a) To the left of $$\omega$$r, the circuit is mainly capacitive.

(b) To the left of $$\omega$$r, the circuit is mainly inductive.

(c) At $$\omega$$r, impedance of the circuit is equal to the resistance of the circuit.

(d) At $$\omega$$r, impedance of the circuit is 0.

Choose the most appropriate answer from the options given below :

A
(a) and (d) only.
B
(b) and (d) only.
C
(a) and (c) only.
D
(b) and (c) only.
3
JEE Main 2022 (Online) 27th June Evening Shift
+4
-1

If L, C and R are the self inductance, capacitance and resistance respectively, which of the following does not have the dimension of time?

A
RC
B
$${L \over R}$$
C
$$\sqrt{LC}$$
D
$${L \over C}$$
4
JEE Main 2022 (Online) 27th June Morning Shift
+4
-1

The current flowing through an ac circuit is given by

I = 5 sin(120$$\pi$$t)A

How long will the current take to reach the peak value starting from zero?

A
$${1 \over {60}}$$ s
B
60 s
C
$${1 \over {120}}$$ s
D
$${1 \over {240}}$$ s
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