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3 years ago

What best describes the angle between a changing electric field and the electromagnetic wave produced by it?

Physics

1 answer:

MrRa [10]3 years ago

7 0

The correct ans is 1.

A changing electric field produces a changing magnetic field which in turn produces a changing electric field. This means that the source has created a changing electric and magnetic fields, perpendicular to each other, that travel away from the source. Electric field, magnetic field and the EM wave are perpendicular to each other. This gives electromagnetic waves their transverse nature.

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In Europe the standard voltage in homes is 220 V instead of the 120 V used in the United States. Therefore a "100-W" European bu

LenKa [72]

Answer:

a) The US power rating for the european bulb must be 27.27 W

b) The current in the United Stated for the european bulb is 0.227A

Explanation:

First of all the bulb is not going to light in 120V like it does in 220V, the bright is going to be much lower (near 1/4). Now, lets take a look on a circuit perspective:

The bulb in a circuit is modeled like a simple resistor, so we have a resistor conected to a voltage source, see figure 1. There we have a current $I_{1}$ given by:

$I_{1}=\frac{V_{1} }{R}$

Where $V_{1}$ is the 220v Input voltage, R is the resistance from the bulb. In the problem we have the power consumption in watts given by:

$W_{1}= V_{1]*I_{1}$

Clearing $I_{1}$

$I_{1} =\frac{I_{1}}{W_{1} } =\frac{100}{220} =0.4545 A$

Now, from ohm's law

$\frac{V_{1} }{I_{1} } =R=\frac{220 }{0.4545 }=484 ohm$

So 484 ohm is the resistance from the bulb.

Now in the circuit lets replace the voltage source from 220v to 120v and lets calculate the current, and the power consuptiom

$I_{2}= \frac{V_{2}}{R}=\frac{110}{484} =0.227 A$

And the power consuptiom:

$W_{2}= V_{2]*I_{2}=110*0.227=27.27Watts$

7 0

3 years ago

I need help ASAP I need to get this right plz plz plz!!!!!

Rina8888 [55]

The atomic nucleus consists of protons and neutrons.

Additional information:

Protons are positively charged particle and neutrons are negatively charged particle.

Hope this will help u...:)

3 0

3 years ago

Read 2 more answers

The strength of gravitational force is dependent on the masses of and distance between two objects.

rodikova [14]

Truer words are seldom written.

7 0

4 years ago

A beam of light is emitted 8.6 cm beneath the surface of a liquid and strikes the air surface 7.2 cm from the point directly abo

Makovka662 [10]

Answer:

n = 1.56

Explanation:

The total reflection attempts occurs when a light beam passes from a medium with a higher index to a medium with a lower nest, at an angle where it occurs we can find them by the refractive relationship

n₁ sin θ₁ = n₂ sin θ₂

n1 = n2 / sin θ₁

For this relationship to be fulfilled, the liquid index must be greater than the air index divided by the sine of the critical angle

Let's use trigonometry to find angle

tan θ = y / x

θ = tan⁻¹ 7.2 / 8.6

θ = 39.94º

n₁ = 1 / sin 39.94

n = 1.56

This is the refractive index of the liquid

4 0

3 years ago

A fan blade is rotating with a constant angular acceleration of 11.5 rad/s2. At what point on the blade, as measured from the ax

vichka [17]

Answer:

Alpha = ω^2 R where R is radius of blade

g = w^2 r where r is distance from center

ω^2 R = 11.5 ω^2 r

R / r = 11.5 / 9.8 = 1.17

Or r = .852 R

Since the angular acceleration depends on both R and ω it seems that one can only get r as it depends on R

7 0

2 years ago