AP EAPCET 2022 - 4th July Morning Shift | Electromagnetic Waves Question 19 | Physics

A beam of light with intensity $$10^{-3} \mathrm{~Nm}^{-2}$$ and cross-sectional area $$20 \mathrm{~cm}^2$$ is incident on a fully reflective surface at angle $$45^{\circ}$$. Then, the force exerted by the beam on the surface is

$$2.3 \times 10^{-15} \mathrm{~N}$$

$$1.33 \times 10^{-14} \mathrm{~N}$$

$$6.67 \times 10^{-15} \mathrm{~N}$$

$$9.4 \times 10^{-15} \mathrm{~N}$$

AP EAPCET 2022 - 4th July Morning Shift

MCQ (Single Correct Answer)

-0

The maximum number of TV signals, that can be transmitted along a co-axial cable is

100

125

140

AP EAPCET 2021 - 20th August Morning Shift

MCQ (Single Correct Answer)

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The electric and the magnetic fields associated with an electromagnetic wave propagating along the $$z$$-axis, can be represented by

$$\left[\mathrm{E}=E_0 \hat{\mathrm{i}}, \mathrm{B}=B_0 \hat{\mathrm{j}}\right]$$

$$\left[\mathrm{E}=E_0 \hat{\mathrm{k}}, \mathrm{B}=B_0 \hat{\mathrm{i}}\right]$$

$$\left[\mathrm{E}=E_0 \hat{\mathrm{j}}, \mathrm{B}=B_0 \hat{\mathrm{i}}\right]$$

$$\left[\mathrm{E}=E_0 \hat{\mathrm{j}}, \mathrm{B}=B_0 \hat{\mathrm{k}}\right]$$

AP EAPCET 2021 - 19th August Evening Shift

MCQ (Single Correct Answer)

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The magnetic field of a plane electromagnetic wave is given by $$B=(400 \propto \mathrm{T})\sin \left[\left(4.0 \times 10^{15} \mathrm{~s}^{-1}\right)\left(t-\frac{x}{c}\right)\right]$$. Average energy density corresponding to the electric field is

$$8 \times 10^{-3} \mathrm{Jm}^{-3}$$

$$31.8 \times 10^{-3} \mathrm{Jm}^{-3}$$

$$80 \times 10^{-3} \mathrm{Jm}^{-3}$$

$$3.18 \times 10^{-3} \mathrm{Jm}^{-3}$$

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