Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

In an electromagnetic wave in free space the root mean square value of the electric field is ${E}_{rms}=6$ V/m. The peak value of the magnetic field is

(a) 1.41$×{10}^{-8}T$

(b) $2.83×{10}^{-8}T$

(c) $0.70×{10}^{-8}T$

(d)

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

Out of the following options which one can be used to produce a propagating electromagnetic wave?

(a) A stationary charge               (b) A chargeless particle

(c) An accelerating charge          (d) A charge moving at constant velocity

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

The energy of the EM wave is of the order of 15 KeV. To which part of the spectrum does it belong?

(a)X-rays

(b)Infrared rays

(c)Ultraviolet rays

(d)$\gamma$-rays

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

The condition under which a microwave oven heats up a food item containing water molecules most efficiently in

(a) the frequency of the microwave must match the resonant frequency of the water molecules

(b) the frequency of the microwave  has no relation with natural frequency of water molecules

(c) microwave are heat waves, so always produce heating

(d) infrared waves produce heating in a microwave oven

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

The electric field associated with an electro magnetic wave in vacuum is given by E= 40cos$\left(kz-6×{10}^{8}t\right),$where E,z and t are in volt/m, metre and second respectively.The value of wave vector k is

(a)                                (b)

(c)                                (d) 3 ${m}^{-1}$

Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:

The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum

is equal to

(a) the speed of light in vacuum

(b) reciprocal of speed of light in vacuum

(c) the ratio of magnetic permeability to the

electric susceptibility of vacuum

(d) unity