AP EAPCET 2025 - 21st May Evening Shift | Electromagnetic Waves Question 10 | Physics

A plane electromagnetic wave of frequency 25 MHz propagates in vacuum along positive $x$-direction. At a particular point in space and time, if the electric field is $63 \hat{\mathrm{j}} \mathrm{Vm}^{-1}$, then the magnitude of the magnetic field of the wave at this point at the same time is

$2.1 \times 10^{-8} \mathrm{~T}$

$4.2 \times 10^{-8} \mathrm{~T}$

$6.3 \times 10^{-8} \mathrm{~T}$

$8.4 \times 10^{-8} \mathrm{~T}$

AP EAPCET 2025 - 21st May Morning Shift

MCQ (Single Correct Answer)

-0

If the magnetic field inside a solenoid is $B$, then the magnetic energy stored in it per unit volume is ( $c=$ speed of light in vacuum and $\varepsilon_0$ is permittivity of free space)

$\varepsilon_0 c^2 B^2$

$\frac{\varepsilon_0 c^2 B^2}{2}$

$2 \varepsilon_0 c^2 B^2$

$\frac{\varepsilon_0 c^2 B^2}{4}$

AP EAPCET 2025 - 21st May Morning Shift

MCQ (Single Correct Answer)

-0

In a plane electromagnetic wave, the magnetic field is given by $\mathbf{B}=3 \times 10^{-7} \sin \left(100 \pi x+10^{12} t\right) \mathrm{T}$, then the wavelength of the wave is

(In the equation $x$ is in metre and $t$ is in second)

0.02 m

0.2 m

0.4 m

0.04 m

AP EAPCET 2024 - 23th May Morning Shift

MCQ (Single Correct Answer)

-0

For plane electromagnetic waves propagating in the positive $z$-direction. The combination which gives the correct possible direction for $\mathbf{E}$ and $\mathbf{B}$ fields respectively is

$(-2 \hat{\mathbf{i}}-3 \hat{\mathbf{j}})$ and $(3 \hat{\mathbf{i}}-2 \hat{\mathbf{j}})$

$(3 \hat{i}+4 \hat{j})$ and $(4 \hat{i}-3 \hat{j})$

$(\hat{\mathbf{i}}-2 \hat{\mathbf{j}})$ and $(-2 \hat{\mathbf{i}}-\hat{\mathbf{j}})$

$(-2 \hat{\mathbf{i}}+3 \hat{\mathbf{j}})$ and $(\hat{\mathbf{i}}+2 \hat{\mathbf{j}})$

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