MCQ
The average value of electric energy density in an electromagnetic wave is :
  • A
    $\frac{1}{2}\varepsilon_0E^2$ 
  • B
    $\frac{E^2}{2 \varepsilon_0}$
  • C
    $\varepsilon_0E^2$ 
  • $\frac{1}{4}\varepsilon_0E^2$ 

Answer

Correct option: D.
$\frac{1}{4}\varepsilon_0E^2$ 
d
Electric energy and magnetic energy is same.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Light from a point source in air falls on a convex spherical glass surface $(\mu = 1.5,$ radius of curvature $= 20\, cm)$ The distance of light source from the glass surface is $100\, cm$. At what position is the image formed.......$cm$
In the given figure a ring of mass $m$ is kept on a horizontal surface while a body of equal mass $'m'$ attached through a string, which is wounded on the ring. When the system is released the ring rolls without slipping. Consider the following statements and choose the  correct option.

$(i)$ acceleration of the centre of mass of ring is $\frac{g}{3}$

$(ii)$ acceleration of the hanging particle is  $\frac{2g}{3}$

$(iii)$ frictional force (on the ring) acts along forward direction

$(iv)$ frictional force (on the ring) acts along backward direction

Two bodies $A$ and $B$ of same mass, area and surface finish with specific heats $S_A$ and $S_B\left(S_A > S_B\right)$ are allowed to cool for given temperature range. Temperature varies with time as ..........
A zener diode in the circuit shown has a knee current of $5\,mA$ and a maximum allowed power dissipation of $300\,mW$ . What are the minimum and maximum load currents that can be drawn safely from the circuit, keeping the output voltage $V_0$ constant at $6\,volts$ ?
A liquid film is formed in a loop of area $0.05$ $m^2$. Increase in its potential energy will be ($T = 0.2\, N/m$)
Two coaxial coils are very close to each other and their mutual inductance is $5 \,mH$. If a current $50 sin 500 \,t$ is passed in one of the coils then the peak value of induced e.m.f in the secondary coil will be ........... $V$
A body is released from the top of a tower of height $h$. It takes $t$ sec to reach the ground. Where will be the ball after time $t/2$ sec
Two radioactive substances $X$ and $Y$ originally have $N _{1}$ and $N _{2}$ nuclei respectively. Half life of $X$ is half of the half life of $Y$. After three half lives of $Y$, number of nuclei of both are equal. The ratio $\frac{ N _{1}}{ N _{2}}$ will be equal to
$Assertion :$ Fahrenheit is the smallest unit measuring temperature.
$Reason :$ Fahrenheit was the first temperature scale used for measuring temperature.
A $300\  kg$ crate is dropped vertically onto a conveyor belt that is moving at $1.20\  m/s$. A motor maintains the belt's constant speed. The belt initially slides under the crate, with a coefficient of friction of $0.400$. After a short time, the crate is moving at the speed of the belt. During the period in which the crate is being accelerated, find the work done by the motor which drives the belt :- ................. $\mathrm{J}$