1
JEE Main 2022 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1

To increase the resonant frequency in series LCR circuit,

A
source frequency should be increased.
B
another resistance should be added in series with the first resistance.
C
another capacitor should be added in series with the first capacitor.
D
the source frequency should be decreased.
2
JEE Main 2022 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1

A small square loop of wire of side $$l$$ is placed inside a large square loop of wire $$\mathrm{L}(\mathrm{L}>>l)$$. Both loops are coplanar and their centres coincide at point $$\mathrm{O}$$ as shown in figure. The mutual inductance of the system is :

A
$$\frac{2 \sqrt{2} \mu_{0} \mathrm{~L}^{2}}{\pi l}$$
B
$$\frac{\mu_{0} l^{2}}{2 \sqrt{2} \pi \mathrm{L}}$$
C
$$\frac{2 \sqrt{2} \mu_{0} l^{2}}{\pi \mathrm{L}}$$
D
$$\frac{\mu_{0} \mathrm{~L}^{2}}{2 \sqrt{2} \pi l}$$
3
JEE Main 2022 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1

The rms value of conduction current in a parallel plate capacitor is $$6.9 \,\mu \mathrm{A}$$. The capacity of this capacitor, if it is connected to $$230 \mathrm{~V}$$ ac supply with an angular frequency of $$600 \,\mathrm{rad} / \mathrm{s}$$, will be :

A
5 pF
B
50 pF
C
100 pF
D
200 pF
4
JEE Main 2022 (Online) 30th June Morning Shift
MCQ (Single Correct Answer)
+4
-1

An expression for oscillating electric field in a plane electromagnetic wave is given as Ez = 300 sin(5$$\pi$$ $$\times$$ 103x $$-$$ 3$$\pi$$ $$\times$$ 1011t) Vm$$-$$1

Then, the value of magnetic field amplitude will be :

(Given : speed of light in Vacuum c = 3 $$\times$$ 108 ms$$-$$1)

A
1 $$\times$$ 10$$-$$6 T
B
5 $$\times$$ 10$$-$$6 T
C
18 $$\times$$ 109 T
D
21 $$\times$$ 109 T
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Physics
Mechanics
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Modern Physics
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