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If the direction of a magnetic field around a vertical electrical wire is counter clockwise, what direction is the electrical cu

strojnjashka [21]

Direction of the current:

From the bottom of the wire to the top

Explanation:

The magnetic field produced by a current-carrying wire forms concentric circles around the wire; its magnitude is given by

$B=\frac{\mu_0 I}{2\pi r}$

whrere

$\mu_0$ is the vacuum permeability

I is the current in the wire

r is the distance from the wire

The direction of the magnetic field produced by a current-carrying wire can be found by using the right-hand rule:

- The thumb of the right hand is placed in the same direction as the current

- The other fingers, wrapped around the thumb, give the direction of the magnetic field

In this case, the wire is vertical and the magnetic field is counter clockwise (looking from the top), therefore we need to put the thumb from the bottom to the top in order to get the same direction for the field: therefore, the direction of the current is

From the bottom of the wire to the top

Learn more about magnetic fields:

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8 0

4 years ago

Two satellites are orbiting earth at different altitudes. Which satellite orbits at a higher speed v around earth? Assume that t

alexandr1967 [171]

Answer:

a) the one with a lower orbit b) the one with a higher orbit

Explanation:

Let's consider orbital mechanics. To get an object in orbit, we need it to fall to earth parallel to the earth's surface. To understand it easily imagine a projectile thrown horizontally further and further away, at one point, the projectile hits the cannon from behind. Considering there is no wind resistance, that would be a projecile in orbit.

In other words, the circular orbits of some objects around a massive body are due to the equality between centrifugal acceleration and gravity acceleration.

$\frac{v^2}{r} = \frac{GM}{r^2}$ .

so the velocity is

$v = \sqrt{\frac{GM}{r} }$

where "G" is the gravitational constant, "M" the mass of the massive body and "r" the distance between the object and the center of gravity of mass M. As you can note, if "r" increase, "v" decrease.

The orbital period of any object in orbit is

$T = 2\pi \sqrt{\frac{a^3}{GM} }$

where "a" is length of semi-major axis (a = r in circular orbits). So if "r" increase, "T" increase.

3 0

4 years ago

A vehicle ___________ occurs when the driver begins to back up and is unaware that a person is behind the vehicle.

jeka94

I don't know accident?

6 0

4 years ago

Read 2 more answers

This diagram shows the movement of a skater at 1-second intervals. What is the magnitude of the average velocity, in m/s, if the

zaharov [31]

Answer: 3 m/s

Explanation:

The average velocity is simply the change in displacement over the specified time interval. I’m this case, we have a total of four intervals,which represent 4 seconds. Dividing 12 m by 4s gives us 3 m/s

6 0

4 years ago

A wire with a current of 1.31 A is to be formed into a circular loop of one turn. If the required value of the magnetic field at

Sliva [168]

Answer:

The required radius is 2.62 cm

Explanation:

Given;

magnitude of current in wire, I = 1.31 A

magnetic field strength, B = 10 µT

Applying Biot Savart equation;

$B = \frac{\mu_o I}{2\pi r} \\\\r = \frac{\mu_o I}{2\pi B}$

where;

r is the radius of the wire

μ₀ is constant = 4π x 10⁻⁷ Tm/A

I is the current in the wire

B is the magnetic field strength

Substitute the given values and calculate the radius

$r = \frac{4 \pi *10^{-7} *1.31}{2\pi *10 *10^{-6}} = 2.62 *10^{-2} \ m = 2.62 \ cm$

Therefore, the required radius is 2.62 cm

4 0

3 years ago