The electric and the magnetic field,associate | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The direction of propagation of an electromagnetic wave is given by the direction of the vector $\vec{E} 	imes \vec{B}$.Given that the wave propa

Vedclass · Accepted Answer

$\vec E = {E_0}\hat i, \vec B = {B_0}\hat j$

Vedclass · Answer

(A) The direction of propagation of an electromagnetic wave is given by the direction of the vector $\vec{E} 	imes \vec{B}$.Given that the wave propagates along the $+z-$ axis,we must have $\vec{E} 	imes \vec{B} = \hat{k}$.Since the electric field $\vec{E}$ and magnetic field $\vec{B}$ must be perpendicular to each other and to the direction of propagation,they must lie in the $xy-$ plane.Checking the options:For option $A$: $\vec{E} = E_0 \hat{i}$ and $\vec{B} = B_0 \hat{j}$.Then $\vec{E} 	imes \vec{B} = (E_0 \hat{i}) 	imes (B_0 \hat{j}) = E_0 B_0 (\hat{i} 	imes \hat{j}) = E_0 B_0 \hat{k}$.This matches the direction of propagation $+z$.Therefore,option $A$ is correct.

The electric and the magnetic field,associated with an $e.m.$ wave,propagating along the $+z-$ axis,can be represented by

Similar Questions

In a triangle,if $r_1 = 2r_2 = 3r_3$,then $\frac{a}{b} + \frac{b}{c} + \frac{c}{a}$ is equal to

$A$ tangent galvanometer has a coil of $25$ turns and a radius of $15 \, cm$. The horizontal component of the earth's magnetic field is $3 \times 10^{-5} \, T$. The current required to produce a deflection of $45^o$ in it is.....$A$

Which of the following statements is true for an $N$-type semiconductor?

The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate $(ATP)$ is formed because

$(p \to q) \leftrightarrow (q \vee \sim p)$ is

Vedclass Test Series

Exam Paper Generator

Online Exam Module