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3 years ago

The direction of the current in an alternating current circuit

2 answers:

7 0

The direction of the current in an alternating current circuit <em>changes repeatedly</em> at a constant rate. The often-ness with which it changes is known as its <em>frequency </em>.

jek_recluse [69]3 years ago

3 0

Answer:

Explanation:

changes repeatedly

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A circular coil has a 18.0 cm radius and consists of 25.0 closely wound turns of wire. An externally produced magnetic field of

djverab [1.8K]

Answer:

The magnetic flux links to its turns = $7.6 \times10^{-3}$ Wb.

Explanation:

Given :

Radius of circular coil = $18 \times 10^{-2}$ m

Number of turns = 25

Magnetic field = $3 \times10^{-3}$ T

Magnetic flux (Φ) is a measure of the magnetic field lines passes through a given area. The unit of magnetic flux is weber (Wb).

We know that,

⇒ Φ = $BA$

Where $B =$ ext. magnetic field, $A =$ area of loop or coil.

But here given in question, we have turns of wire so our above eq. modified as follows.

⇒ Φ = $NBA$

Where $N =$ no. of turns.

∴ Φ = $25 \times 3 \times 10^{-3} \pi (18 \times10^{-2} )^{2}$

Φ = $7.6 \times 10^{-3} Wb$

Thus, the magnetic flux links to its turns = $7.6 \times 10^{-3} Wb$

3 0

4 years ago

need help with the ones that have numbers on the sides.#1 #2 #3 #4 please help.i will pick fair brainliest answer

SOVA2 [1]

1. Some stars are bigger than others, some are different colors or temperatures. It all really depends on the age of the star.

2. Four differences could be:

1) Outer planets are much farther away from the sun, so they get less sunlight than inner planets.
2) Also, the outer planets are all gas giants (excluding Pluto), while inner planets are all rocky planets.
3) Inner planets also have a much higher density than outer planets.
4) Outer planets also tend to have many more moons than inner planets (such as Jupiter, with 63 known moons).

3. The barrier that separates the inner from the outer planets is a ring of space rocks known as the Asteroid Belt.

A comet is a ball of ice that orbits a star in a wide elliptical orbit.
An asteroid is a large rocky body that orbits a star, and could be anywhere in size from 600 miles across to tiny dust particles.
A meteoroid is a small object floating through space freely (not necessarily bound in any orbit) that is usually made of a rocky or metallic material.

4. Day and night are caused by the earth's rotation on its axis. Night is relative to the observer, and occurs when the observer is on the side opposite that on which the sun is shining.

Hope that helped =)

4 0

3 years ago

Read 2 more answers

What is the function of the commutator in a DC motor? A. to spin the magnet B. to change direct current into alternating current

sergejj [24]

Answer

Correct Answer is B(to change direct current into alternating current)

Explanation

commutation

The main aim of commutation is to maintain the torque acting on armature of DC motros in the same direction.

commutator a switch which is used to convert the direction of flow of electric current it is connected to the armature of DC motor.

In DC motors, voltage across the armature is alternating in nature. The direction of this current is reverses by Commutator when armature of DC motors passes through magnetic neutral axis to maintain the unidirectional. Hence, commutator is used to change direct current into alternating current.

6 0

3 years ago

A ray of light crosses a boundary between two transparent materials. The medium the ray enters has a larger optical density. Whi

Tpy6a [65]

Answer:

The wavelength of the light decreases as it enters into the medium with the greater optical density.

The frequency of the light remains constant as it transitions between materials.

Explanation:

- When a ray of light crosses a boundary between two different materials, it undergoes refraction: the ray changes direction, and it also changes speed, according to the relationship:

$v=\frac{c}{n}$

where v is the speed of the ray of light in the material, c is the speed of light in a vacuum, n is the index of refraction of the material, which is larger for a medium with larger optical density. So, from the equation, we see that the larger the optical density, the smaller the speed of the wave.

- The frequency of the light does not depend on the properties of the medium, so it remains unchanged: therefore the statement

The frequency of the light remains constant as it transitions between materials.

is correct.

- Moreover, the wavelength of the ray of light is related to the speed and the frequency by the equation

$\lambda=\frac{v}{f}$

where v is the speed and f the frequency. Since we have seen that v decreases and f remains constant, this means that the wavelength decreases as well, so the statement

The wavelength of the light decreases as it enters into the medium with the greater optical density.

is also correct.

5 0

3 years ago

How do solve for a in yf=yi+vi *t + 1/2*at^2. Also, What’s this formulas name

ddd [48]

Answer:

Kinematics

Explanation:

8 0

4 years ago

Read 2 more answers