Question 152: EM waves

Question

Consider an electromagnetic wave propagating in vacuum. Choose the correct
statement :

Accepted Answer

As wave is propagating in   + x   direction, then   $$\overrightarrow E $$  and   $$\overrightarrow B $$  should be function of   $$\left( {x,t} \right)$$  and must be in   y $$-$$ z   plane.

Answer

For an electromagnetic wave propagating in +x direction the electric field is $$\vec E = {1 \over {\sqrt 2 }}{E_{yz}}{\mkern 1mu} \left( {x,t} \right)\left( {\hat y - \hat z} \right)$$
and the magnetic field is $$\vec B = {1 \over {\sqrt 2 }}{B_{yz}}{\mkern 1mu} \left( {x,t} \right)\left( {\hat y + \hat z} \right)$$

Answer

For an electromagnetic wave propagating in +x direction the electric field is
$$\vec E = {1 \over {\sqrt 2 }}{E_{yz{\mkern 1mu} }}\left( {y,z,t} \right)\left( {\hat y + \hat z} \right)$$
and the magnetic field is $$\vec B = {1 \over {\sqrt 2 }}{B_{yz{\mkern 1mu} }}\left( {y,z,t} \right)\left( {\hat y + \hat z} \right)$$

Answer

For an electromagnetic wave propagating in + y direction the electric field is
$$\overrightarrow E  = {1 \over {\sqrt 2 }}{E_{yz{\mkern 1mu} }}\left( {x,t} \right)\widehat y$$
and the magnetic field is $$\vec B = {1 \over {\sqrt 2 }}{B_{yz{\mkern 1mu} }}\left( {x,t} \right)\widehat z$$

Answer

For an electromagnetic wave propagating in + y direction the electric field is 
$$\overrightarrow E  = {1 \over {\sqrt 2 }}{E_{yz{\mkern 1mu} }}\left( {x,t} \right)\widehat z$$
and the magnetic field is $$\overrightarrow B  = {1 \over {\sqrt 2 }}{B_{z{\mkern 1mu} }}\left( {x,t} \right)\widehat y$$

EM waves

Consider an electromagnetic wave propagating in vacuum. Choose the correct statement :

Choose the correct answer: