1

JEE Main 2020 (Online) 4th September Evening Slot

MCQ (Single Correct Answer)

+4

-1

A series L-R circuit is connected to a battery of emf V. If the circuit is switched on at t = 0, then
the time at which the energy stored in the inductor reaches $$\left( {{1 \over n}} \right)$$ times of its maximum value, is :

2

JEE Main 2020 (Online) 4th September Morning Slot

MCQ (Single Correct Answer)

+4

-1

Choose the correct option relating wave lengths of different parts of electromagnetic wave spectrum:

3

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

+4

-1

The electric field of a plane electromagnetic wave propagating along the x direction in vacuum is

$$\overrightarrow E = {E_0}\widehat j\cos \left( {\omega t - kx} \right)$$.

The magnetic field $$\overrightarrow B $$ , at the moment t = 0 is :

$$\overrightarrow E = {E_0}\widehat j\cos \left( {\omega t - kx} \right)$$.

The magnetic field $$\overrightarrow B $$ , at the moment t = 0 is :

4

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 :Questions Asked from Alternating Current and Electromagnetic Induction (MCQ (Single Correct Answer))

Number in Brackets after Paper Indicates
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