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3 years ago

10

What planets experience an eclipse from the sun

1 answer:

SVETLANKA909090 [29]3 years ago

7 0

Answer:

Earth

Explanation:

The sun and the moon come together and they seem like one bonded.

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The electric field of a plane standing electromagnetic wave in a vacuum is given by Ey- Eosin(kx)cos(ot). What is the correspond

Tom [10]

Answer:

$B=-\dfrac{E_o}{c}cos(kx)sin(\omega t)\ k$

Explanation:

The electric field of a plane standing electromagnetic wave in a vacuum is given by :

$E_y=E_o\ sin(kx)cos(\omega t)$

We need to find the corresponding expression for the magnetic field. According to equation of Maxwell's :

$\bigtriangledown \times E=-\dfrac{\partial B}{\partial t}$

$\bigtriangledown \times E=\begin{vmatrix}i & j & k\\ \dfrac{\partial}{\partial x} & \dfrac{\partial }{\partial y} & \dfrac{\partial}{\partial z}\\ 0& E_o\ sin(kx)cos(\omega t) & 0 \end{vmatrix}$

$\bigtriangledown \times E=k[E_ok\ cos(kx)cos(\omega t)]=-\dfrac{\partial B}{\partial t}$

$B=\int\limits {kE_ok\ cos(kx)cos(\omega t).dt}$

$B=-\dfrac{E_ok}{\omega}cos(kx)sin(\omega t)$

Since, $\omega=ck$

$B=-\dfrac{E_o}{c}cos(kx)sin(\omega t)\ k$

So, the corresponding expression for the magnetic field is $-\dfrac{E_o}{c}cos(kx)sin(\omega t)\ k$ . Hence, this is the required solution.

5 0

3 years ago

An electric iron has a rating of 750w and 220v then calculate the current flowing through it and the resistance

Zolol [24]

Watt = voltage x ampere
750 = 220 x ampere
Ampere = 750 / 220
Resistance = voltage / ampere
= 220^2 / 750

8 0

3 years ago

A large cube (mass = 25 kg) being accelerated across a horizontal frictionless surface by a horizontal force . A small cube mass

belka [17]

Answer:F=400.28 N

Explanation:

Given

mass of large cube $M=25 kg$

mass of small cube $m=4 kg$

coefficient of static friction $\mu =0.71$

acceleration a of the system is given by

$F=(M+m)a$

$a=\frac{F}{M+m}$

Now Normal reaction between two blocks is given by

$N=ma$

friction tries to balance weight

thus $f_r=mg$

and $f_r=\mu N$

$f_r=\mu ma$

$\mu ma=mg$

$\mu \frac{F}{M+m}=g$

$F=\frac{(M+m)g}{\mu }$

$F=\frac{29\times 9.8}{0.71}$

$F=400.28 N$

7 0

3 years ago

Magnetic levitation has been used to innovate which aspect of life? Give examples

telo118 [61]

Communication,Mapping,transportation,and space exploration

3 0

4 years ago

loris [4]

There is a net force of 15N in The direction of Levi

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3 years ago

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