1

JEE Main 2020 (Online) 3rd September Morning Slot

MCQ (Single Correct Answer)

+4

-1

The magnetic field of a plane electromagnetic wave is

$$\overrightarrow B = 3 \times {10^{ - 8}}\sin \left[ {200\pi \left( {y + ct} \right)} \right]\widehat i$$ T

where c = 3 $$ \times $$ 10

$$\overrightarrow B = 3 \times {10^{ - 8}}\sin \left[ {200\pi \left( {y + ct} \right)} \right]\widehat i$$ T

where c = 3 $$ \times $$ 10

^{8}ms^{–1}is the speed of light. The corresponding electric field is :2

JEE Main 2020 (Online) 2nd September Evening Slot

MCQ (Single Correct Answer)

+4

-1

In a plane electromagnetic wave, the directions
of electric field and magnetic field are
represented by $$\widehat k$$ and $$2\widehat i - 2\widehat j$$, respectively.
What is the unit vector along direction of
propagation of the wave?

3

JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (Single Correct Answer)

+4

-1

A plane electromagnetic wave, has

frequency of 2.0 $$ \times $$ 10

( $${1 \over {4\pi {\varepsilon _0}}} = 9 \times {10^9}{{N{m^2}} \over {{C^2}}}$$ and speed of light

= 3 $$ \times $$ 10

frequency of 2.0 $$ \times $$ 10

^{10}Hz and its energy density is 1.02 $$ \times $$ 10^{–8}J/m^{3}in vacuum. The amplitude of the magnetic field of the wave is close to( $${1 \over {4\pi {\varepsilon _0}}} = 9 \times {10^9}{{N{m^2}} \over {{C^2}}}$$ and speed of light

= 3 $$ \times $$ 10

^{8}ms^{–1})4

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A plane electromagnetic wave is propagating
along the direction
$${{\widehat i + \widehat j} \over {\sqrt 2 }}$$
, with its polarization
along the direction $$\widehat k$$ . The correct form of the
magnetic field of the wave would be (here B

_{0}is an appropriate constant) :Questions Asked from Electromagnetic Waves (MCQ (Single Correct Answer))

Number in Brackets after Paper Indicates No. of Questions

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