1
JEE Main 2022 (Online) 26th June Morning Shift
+4
-1 In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size $${\lambda \over {100}}$$, where $$\lambda$$ is the wavelength of the wave in free space. The phenomenon, which happens there will be :

A
Reflection
B
Refraction
C
Diffraction
D
Scattering
2
JEE Main 2022 (Online) 25th June Evening Shift
+4
-1 The electromagnetic waves travel in a medium at a speed of 2.0 $$\times$$ 108 m/s. The relative permeability of the medium is 1.0. The relative permittivity of the medium will be :

A
2.25
B
4.25
C
6.25
D
8.25
3
JEE Main 2022 (Online) 25th June Morning Shift
+4
-1 The electric field in an electromagnetic wave is given by E = 56.5 sin $$\omega$$(t $$-$$ x/c) NC$$-$$1. Find the intensity of the wave if it is propagating along x-axis in the free space.

(Given : $$\varepsilon$$0 = 8.85 $$\times$$ 10$$-$$12C2N$$-$$1m$$-$$2)

A
5.65 Wm$$-$$2
B
4.24 Wm$$-$$2
C
1.9 $$\times$$ 10$$-$$7 Wm$$-$$2
D
56.5 Wm$$-$$2
4
JEE Main 2022 (Online) 24th June Evening Shift
+4
-1 An electric bulb is rated as 200 W. What will be the peak magnetic field at 4 m distance produced by the radiations coming from this bulb? Consider this bulb as a point source with 3.5% efficiency.

A
1.19 $$\times$$ 10$$-$$8T
B
1.71 $$\times$$ 10$$-$$8T
C
0.84 $$\times$$ 10$$-$$8T
D
3.36 $$\times$$ 10$$-$$8T
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Mechanics
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Optics
Modern Physics
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