1
JEE Main 2022 (Online) 24th June Morning Shift
+4
-1

A resistance of 40 $$\Omega$$ is connected to a source of alternating current rated 220 V, 50 Hz. Find the time taken by the current to change from its maximum value to the rms value :

A
2.5 ms
B
1.25 ms
C
2.5 s
D
0.25 s
2
JEE Main 2022 (Online) 24th June Morning Shift
+4
-1

A plane electromagnetic wave travels in a medium of relative permeability 1.61 and relative permittivity 6.44. If magnitude of magnetic intensity is 4.5 $$\times$$ 10$$-$$2 Am$$-$$1 at a point, what will be the approximate magnitude of electric field intensity at that point?

(Given : Permeability of free space $$\mu$$0 = 4$$\pi$$ $$\times$$ 10$$-$$7 NA$$-$$2, speed of light in vacuum c = 3 $$\times$$ 108 ms$$-$$1)

A
16.96 Vm$$-$$1
B
2.25 $$\times$$ 10$$-$$2 Vm$$-$$1
C
8.48 Vm$$-$$1
D
6.75 $$\times$$ 106 Vm$$-$$1
3
JEE Main 2021 (Online) 1st September Evening Shift
+4
-1
For the given circuit the current i through the battery when the key in closed and the steady state has been reached is __________.

A
6 A
B
25 A
C
10 A
D
0 A
4
JEE Main 2021 (Online) 31st August Evening Shift
+4
-1
Statement - I :

To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect a capacitor across the output parallel to the load RL.

Statement - II :

To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect an inductor in series with RL.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Statement I is true but Statement II is false
B
Statement I is false but Statement II is true
C
Both Statement I and Statement II are false
D
Both Statement I and Statement II are true
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