2 years ago

How are magnetic poles and electrical charges similar?

Physics

2 answers:

pshichka [43]2 years ago

7 0

Answer: The correct answer is "Their same forces repel each other, and their opposite forces attract each other".

Explanation:

Magnet has two poles: South pole and North pole.

There is magnetic force of repulsion between the same poles as the same poles repel each other. There is magnetic force of attraction between the opposite poles as the opposite poles attract each other.

The charges can be negative and positive.

There is electrostatic force of repulsion between the same charges as the same charges repel each other. There is electrostatic force of attraction between the opposite charges as the opposite charges attract each other.

Therefore, the correct option is (A).

exis [7]2 years ago

3 0

I believe the answer is a

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2 years ago

Ignoring reflection at the air-water boundary, if the amplitude of a 10 GHz incident wave in air is 20 V/m at the water surface,

dimaraw [331]

Answer:

0.80267 m

Explanation:

E(z) = Electric field = 1 µV/m

$E_0$ = 20 V/m

z = Depth

$\sigma$ = Conductivity = 0.1 S/m

$\epsilon_r$ = 81

$\mu$ = Impedance of free space = $120\pi\ \Omega$

Frequency is given by

$E(z)=E_0e^{-\alpha z}$

Parameter is given by

$\alpha=\dfrac{\sigma}{2}\sqrt{\dfrac{\mu}{\epsilon_r}}\\\Rightarrow \alpha=\dfrac{1}{2}\sqrt{\dfrac{(120\pi)^2}{81}}\\\Rightarrow \alpha=20.94395\ N_p/m$

From the first equation

$1\times 10^{-6}=20e^{-20.94395z}\\\Rightarrow ln\dfrac{1\times 10^{-6}}{20}=-20.94395z\\\Rightarrow z=\dfrac{ln\dfrac{1\times 10^{-6}}{20}}{-20.94395}\\\Rightarrow z=0.80267\ m$