Electromagnetic waves Quiz 1

Question 1

Electromagnetic waves,

Accepted Answer

All the above

Answer

Are transverse waves

Answer

Follow the law of superposition

Answer

Travel in vacuum with the speed of light

Question 2

The electric and magnetic fields of an EM wave travelling in any medium have a constant ratio and they,

Accepted Answer

Are in phase with each other

Answer

Are $${{90}^{0}}$$ out of phase

Answer

Are $${{180}^{0}}$$ out of phase

Answer

None of the above

Question 3

The directional energy flux of an electromagnetic wave that is the energy per unit area per unit time is,

Accepted Answer

Poynting vector

Answer

Polarization

Answer

Field energy

Answer

None of the above

Question 4

The magnetic component of EM waves is $$3.4	imes {{10}^{-8}}$$ T, what is the electric component of this EM wave?

Accepted Answer

$$10.2$$ V/m

Answer

$$9$$ V/m

Answer

$$14$$ V/m

Answer

$$11.56$$ V/m

Question 5

The relationship between the magnitudes of electric field and magnetic field of EM wave travelling in vacuum is given by

Accepted Answer

$${{B}_{0}}=\dfrac{{{E}_{0}}}{c}$$

Answer

$${{E}_{0}}=\dfrac{{{B}_{0}}}{c}$$

Answer

$${{B}_{0}}=c{{E}_{0}}$$

Answer

$${{B}_{0}}=\sqrt{\dfrac{{{E}_{0}}}{c}}$$