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4
MCQ (Single Correct Answer)

The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is $E$. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is

A
$\frac{E}{2}$
B
$2 E$
C
$\frac{E}{\sqrt{2}}$
D
$\sqrt{2} E$
5
MCQ (Single Correct Answer)

If $\mathbf{E}$ and $\mathbf{B}$ represent electric and magnetic field vectors of the electromagnetic wave, the direction of propagation of electromagnetic wave is along

A
$\mathbf{E}$
B
B
C
$\mathbf{B} \times \mathbf{E}$
D
$\mathbf{E} \times \mathbf{B}$
6
MCQ (Single Correct Answer)

The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is

A
$\mathrm{c}: 1$
B
$c^2: 1$
C
$1: 1$
D
$\sqrt{C}: 1$
7
MCQ (Single Correct Answer)

An EM wave radiates outwards from a dipole antenna, with $E_o$ as the amplitude of its electric field vector. The electric field $E_o$ which transports significant energy from the source falls off as

A
$\frac{1}{r^3}$
B
$\frac{1}{r^2}$
C
$\frac{1}{r}$
D
remains constant
8
MCQ (Single Correct Answer)

An electromagnetic wave travels in vacuum along $z$-direction $\mathbf{E}=\left(E_1 \hat{\mathbf{i}} E_2 \hat{\mathbf{j}}\right) \cos (k z-\omega t)$. Choose the correct options from the following

A
The associated magnetic field is given as $$\mathbf{B}=\frac{1}{C}\left(E_1 \hat{\mathbf{i}}-E_2 \hat{\mathbf{j}}\right) \cos (k z-\omega t)$$
B
The associated magnetic field is given as $$\mathbf{B}=\frac{1}{C}\left(E_1 \hat{\mathbf{i}}-E_2 \hat{\mathbf{j}}\right) \cos (k z-\omega t)$$
C
The given electromagnetic field is circularly polarised
D
The given electromagnetic wave is plane polarised
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