For plan electromagnetic waves propagating in the $z-$ direction, which one of the following combination gives the correct possible direction for $\vec E$ and $\vec B$ field respectively?
$\left( {2\hat i + 3\hat j} \right)$ and $\left( {\hat i + 2\hat j} \right)$
$\left( {-2\hat i - 3\hat j} \right)$ and $\left( {3\hat i - 2\hat j} \right)$
$\left( {3\hat i + 4\hat j} \right)$ and $\left( {4\hat i - 3\hat j} \right)$
$\left( {\hat i + 2\hat j} \right)$ and $\left( {2\hat i - \hat j} \right)$
A long straight wire of resistance $R$, radius $a $ and length $ l$ carries a constant current $ I.$ The Poynting vector for the wire will be
A lamp emits monochromatic green light uniformly in all directions. The lamp is $3%$ efficient in converting electrical power to electromagnetic waves and consumes $100\,W $ of power. The amplitude of the electric field associated with the electromagnetic radiation at a distance of $10m$ from the lamp will be........$V/m$
A particle of charge $q$ and mass $m$ is moving along the $x-$ axis with a velocity $v,$ and enters a region of electric field $E$ and magnetic field $B$ as shown in figures below. For which figure the net force on the charge may be zero :-
A plane electromagnetic wave of wave intensity $6\,W/m^2$ strike a small mirror of area $30\,cm^2$ , held perpendicular to a approching wave. The momentum transmitted in $kg\, m/s$ by the wave to the mirror each second will be
Which of the following is $NOT$ true for electromagnetic waves ?