MCQ
When $EM$ wave propagates through vacuum then
- A$E-$ field leads $B-$ field
- B$E-$ field lags $B-$ field
- ✓$E-$ field and $B-$ field are in the same phase
- DEnergy is stored only in $E-$ field
✓
Answer
Correct option: C.
$E-$ field and $B-$ field are in the same phase
c
In vacuum $E$ and $B$ are in the same in phase $EM$ waves.
In vacuum $E$ and $B$ are in the same in phase $EM$ waves.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A bird is sitting in a large closed cage which is placed on a spring balance. It records a weight of $25\,N$. The bird (mass $m = 0.5 \,kg$) flies upward in the cage with an acceleration of $2\,m/{s^2}$. The spring balance will now record a weight of ........ $N$
→In a particle accelerator, a current of $500 \,\mu A$ is carried by a proton beam in which each proton has a speed of $3 \times 10^7 \,m / s$. The cross-sectional area of the beam is $1.50 \,mm ^2$. The charge density in this beam (in $C / m ^3$ ) is close to
→A conducting rod $PQ$ of length $L = \,1.0 \,m$ is moving with a uniform speed $v = 2 \,m/s$ in a uniform magnetic field $B = 4.0\,T$ directed into the paper. A capacitor of capacity $C = 10\, \mu$F is connected as shown in figure. Then
→Two identical coherent sound sources $R$ and $S$ with frequency $f$ are $5 \,m$ apart. An observer standing equidistant from the source and at a perpendicular distance of $12 \,m$ from the line $R S$ hears maximum sound intensity.When he moves parallel to $R S$, the sound intensity varies and is a minimum when he comes directly in front of one of the two sources. Then, a possible value of $f$ is close to ............ $Hz$ (the speed of sound is $330 \,m / s$ )
→An automobile moves on a road with a speed of $54 \,km h^{-1}.$ The radius of its wheels is $0.45\, m$ and the moment of inertia of the wheel about its axis of rotation is $3\, kg m^2$. If the vehicle is brought to rest in $15\, s,$ the magnitude of average torque transmitted by its brakes to the wheel is .......... $kg \,m^2\, s^{-2}$.
→The disintegration rate of a certain radioactive sample at any instant is $4250$ disintegrations per minute.$10$ minutes later, the rate becomes $2250$ disintegrations per minute. The approximate decay cons $.........\min^{-1}$
→Bulk modulus was first defined by
A galvanometer of resistance $50\, \Omega$ is connected to a battery of $3\, V$ along with a resistance of $2950\, \Omega$ in series. A full scale deflection of $30$ divisions is obtained in the galvanometer. In order to reduce this deflection to $20$ divisions, the resistance in series should be.......$Ω$
→The dispersive powers of glasses of lenses used in an achromatic pair are in the ratio $5 : 3.$ If the focal length of the concave lens is $15 cm$, then the nature and focal length of the other lens would be
→A sphere of $4\, cm$ radius is suspended within a hollow sphere of $6\, cm$ radius. The inner sphere is charged to potential $3\, e.s.u.$ and the outer sphere is earthed. The charge on the inner sphere is.....$e.s.u.$
→