1
JEE Main 2021 (Online) 18th March Morning Shift
+4
-1
A plane electromagnetic wave of frequency 100 MHz is travelling in vacuum along the x-direction. At a particular point in space and time, $$\overrightarrow B = 2.0 \times {10^{ - 8}}\widehat kT$$. (where, $$\widehat k$$ is unit vector along z-direction) What is $$\overrightarrow E$$ at this point?
A
0.6 $$\widehat j$$ V/m
B
6.0 $$\widehat k$$ V/m
C
6.0 $$\widehat j$$ V/m
D
0.6 $$\widehat k$$ V/m
2
JEE Main 2021 (Online) 16th March Morning Shift
+4
-1
A plane electromagnetic wave of frequency 500 MHz is travelling in vacuum along y-direction. At a particular point in space and time,
$$\overrightarrow B$$ = 8.0 $$\times$$ 10$$-$$8 $$\widehat z$$T. The value of electric field at this point is :

(speed of light = 3 $$\times$$ 108 ms$$-$$1)

$$\widehat x$$, $$\widehat y$$, $$\widehat z$$ are unit vectors along x, y and z directions.
A
2.6 $$\widehat x$$ V/m
B
$$-$$24 $$\widehat x$$ V/m
C
24 $$\widehat x$$ V/m
D
$$-$$2.6 $$\widehat y$$ V/m
3
JEE Main 2021 (Online) 16th March Morning Shift
+4
-1
For an electromagnetic wave travelling in free space, the relation between average energy densities due to electric (Ue) and magnetic (Um) fields is :
A
Ue = Um
B
Ue $$\ne$$ Um
C
Ue < Um
D
Ue > Um
4
JEE Main 2021 (Online) 24th February Evening Shift
+4
-1
Match List - I with List - II.

List I List II
(a) Source of microwave frequency (i) Radioactive decay of nucleus
(b) Source of infrared frequency (ii) Magnetron
(c) Source of Gamma Rays (iii) Inner shell electrons
(d) Source of X-rays (iv) Vibration of atoms and molecules
(v) LASER
(vi) RC circuit

Choose the correct answer from the options given below :
A
(a)-(vi), (b)-(v), (c)-(i), (d)-(iv)
B
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
C
(a)-(ii), (b)-(iv), (c)-(vi), (d)-(iii)
D
(a)-(vi), (b)-(iv), (c)-(i), (d)-(v)
EXAM MAP
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