Question Text
Question 2 :
The electric field portion of an electromagnetic wave is given by(all variables in SI units) $E=10^{-4}\sin(6\times 10^5t-0.01x)$. The frequency (f) and the speed(v) of electromagnetic wave are?
Question 4 :
If the magnetic field of a plane electromagnetic wave is given by (The speed of light $= 3\times 10^{8}/ m/s) B = 100\times 10^{-6} \sin \left [2\pi \times 2\times 10^{15} \left (t - \dfrac {x}{c}\right )\right ]$ then the maximum electric field associated with it is
Question 5 :
A plane EM wave travelling alone z-direction is described by ${ \overrightarrow { E } \  =\  { E }_{ 0 } }\sin { (kz\  -\  \omega t)\hat{ i } }$ and ${\vec B\  =\  { B }_{ 0 } }\sin { (kz\  -\  \omega t)\hat{ j } }$.
Question 6 :
Suppose that the electric field amplitude of an electromagnetic wave propagating along x-direction is ${ E }_{ 0}$ = 120 N ${ C }^{ -1 }$ and that its frequency is $\upsilon$ = 50.0 MHz.
Question 7 :
A $1.5\ kW$ (kilo-watt) laser beam of wavelength $6400 \mathring A$ is used to levitate a thin aluminium disc of same area as the cross section of the beam. The laser light is reflected by the aluminium disk without any absorption. The mass of the disc is close to:<br/>