1
JEE Main 2019 (Online) 10th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
If the magnetic field of a plane electromagnetic wave is given by (the speed of light = 3 × 108 B = 100 × 10–6 sin $$\left[ {2\pi \times 2 \times {{10}^{15}}\left( {t - {x \over c}} \right)} \right]$$ then the maximum electric field associated with it is -
A
4.5 $$ \times $$ 104 N/C
B
4 $$ \times $$ 104 N/C
C
6 $$ \times $$ 104 N/C
D
3 $$ \times $$ 104 N/C
2
JEE Main 2019 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The energy associated with electric field is (UE) and with magnetic field is (UB) for an electromagnetic wave in free space. Then :
A
$${U_E} = {{{U_B}} \over 2}$$
B
$${U_E} > {U_B}$$
C
$${U_E} < {U_B}$$
D
$${U_E} = {U_B}$$
3
JEE Main 2019 (Online) 9th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A plane electromagnetic wave of frequency 50 MHz travels in free space along the positive x-direction. At a particular point in space and time, $$\overrightarrow E = 6.3\widehat j\,V/m.$$ The corresponding magnetic field $$\overrightarrow {B,} $$ at that point will be :
A
18.9 $$ \times $$ 10$$-$$8 $$\widehat k$$T
B
2.1 $$ \times $$ 10$$-$$8 $$\widehat k$$T
C
6.3 $$ \times $$ 10$$-$$8 $$\widehat k$$T
D
18.9 $$ \times $$ 108 $$\widehat k$$T
4
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A plane electromagnetic wave of wavelength $$\lambda $$ has an intensity I. It is propagatting along the positive Y-direction. The allowed expressions for the electric and magnetic fields are givn by :
A
JEE Main 2018 (Online) 16th April Morning Slot Physics - Electromagnetic Waves Question 125 English Option 1
B
JEE Main 2018 (Online) 16th April Morning Slot Physics - Electromagnetic Waves Question 125 English Option 2
C
JEE Main 2018 (Online) 16th April Morning Slot Physics - Electromagnetic Waves Question 125 English Option 3
D
JEE Main 2018 (Online) 16th April Morning Slot Physics - Electromagnetic Waves Question 125 English Option 4
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