1
JEE Main 2014 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Match List I (Wavelength range of electromagnetic spectrum) with List II. (Method of production of these waves) and select the correct option from the options given below the lists.

JEE Main 2014 (Online) 9th April Morning Slot Physics - Electromagnetic Waves Question 132 English
A
(a)-(iv),  (b)-(iii),  (c)-(ii),  (d)-(i)
B
(a)-(iii),  (b)-(iv),  (c)-(i),  (d)-(ii)
C
(a)-(ii),  (b)-(iii),  (c)-(iv),  (d)-(i)
D
(a)-(i),  (b)-(ii),  (c)-(iii),  (d)-(iv)
2
JEE Main 2015 (Online) 11th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
For plane electromagnetic waves propagating in the z direction, which one of the following combination gives the correct possible direction for $$\overrightarrow E $$ and $$\overrightarrow B $$ field respectively ?
A
$$\left( {\widehat i + 2\widehat j} \right)\,\,$$ and $$\left( {2\widehat i - \widehat j} \right)$$
B
$$\left(-\, {2\widehat i - 3\widehat j} \right)$$ and $$\left( {3\widehat i - 2\widehat j} \right)$$
C
$$\left( {2\widehat i + 3\widehat j} \right)$$ and $$\left( {\widehat i + 2\widehat j} \right)$$
D
$$\left( {3\widehat i + 4\widehat j} \right)$$ and $$\left( {4\widehat i - 3\widehat j} \right)$$
3
JEE Main 2015 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
An electromagnetic wave travelling in the x-direction has frequency of 23 $$ \times $$ 1014 Hz and electric field amplitude of 27 Vm$$-$$1. From the options given below, which one describes the magnetic field for this wave ?
A
$$\overrightarrow B $$ (x, t) = (3 $$ \times $$ 10$$-$$8T) $$\widehat j$$

sin [ 2$$\pi $$ (1.5 $$ \times $$ 10$$-$$8x $$-$$ 2 $$ \times $$ 1014t)]
B
$$\overrightarrow B $$ (x, t) = (9 $$ \times $$ 10$$-$$8T) $$\widehat k$$

sin [ 2$$\pi $$ (1.5 $$ \times $$ 10$$-$$6x $$-$$ 2 $$ \times $$ 1014t)]
C
$$\overrightarrow B $$ (x, t) = (9 $$ \times $$ 10$$-$$8T) $$\widehat i$$

sin [ 2$$\pi $$ (1.5 $$ \times $$ 10$$-$$8x $$-$$ 2 $$ \times $$ 1014t)]
D
$$\overrightarrow B $$ (x, t) = (9 $$ \times $$ 10$$-$$8T) $$\widehat j$$

sin [(1.5 $$ \times $$ 10$$-$$6 x $$-$$ 2 $$ \times $$ 1014t)]
4
JEE Main 2025 (Online) 7th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The unit of $\sqrt{\frac{2I}{\varepsilon_0 c}}$ is :

(I = intensity of an electromagnetic wave, c = speed of light)

A

Vm

B

NC-1

C

NC

D

Nm

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