COMEDK 2025 Evening Shift | Electromagnetic Waves Question 1 | Physics

A plane electromagnetic wave with frequency 40 MHz travels in free space. At a particular point in space and time, the magnetic field is $2 \times 10^{-8} T$. What will be the electric field at this point?

$16 \mathrm{Vm}^{-1}$

$6 \mathrm{Vm}^{-1}$

$8 \mathrm{Vm}^{-1}$

$18 \mathrm{Vm}^{-1}$

COMEDK 2025 Morning Shift

MCQ (Single Correct Answer)

-0

The electric and magnetic fields associated with an electromagnetic wave propagating along +z axis, can be represented by

$E=E_0 i, \quad B=B_0 j$

$E=E_0 i, \quad B=B_0 k$

$E=E_0 k, \quad B=B_0 j$

$E=E_0 j, \quad B=B_0 k$

COMEDK 2024 Evening Shift

MCQ (Single Correct Answer)

-0

Column - I lists the waves of the electromagnetic spectrum. Column - II gives approximate frequency range of these waves. Match Column - I and Column - II and choose the correct match from the given choices.

	Column I		Column II
(A)	Radiowaves	(P)	$$ 10^{18} \text { to } 10^{20} \mathrm{~Hz} $$
(B)	Microwaves	(P)	$$ 10^{11} \text { to } 5 \times 10^{14} \mathrm{~Hz} $$
(C)	Infrared	(R)	$$ 10^4 \text { to } 10^8 \mathrm{~Hz} $$
(D)	X-rays	(S)	$$ 10^9 \text { to } 10^{12} \mathrm{~Hz} $$

(A)-(R) (B)-(P) (C)-(S) (D)-(Q)

(A)-(R) (B)-(S) (C)-(Q) (D)-(P)

(A)-(R) (B)-(S) (C)-(P) (D)-(Q)

(A)-(R) (B)-(Q) (C)-(S) (D)-(P)

COMEDK 2024 Afternoon Shift

MCQ (Single Correct Answer)

-0

An electromagnetic wave of frequency $$3 \mathrm{~MHz}$$ passes from vacuum into a dielectric medium $$(\mu_r=1)$$ of relative permittivity 4.0. Then,

Wavelength is halved and frequency is doubled

Wavelength doubled and frequency remains unchanged

Wavelength and frequency are unchanged

Wavelength is halved and frequency remains unchanged

COMEDK Subjects