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Alecsey [184]
3 years ago
7

Two circular coils are concentric and lie in the same plane. The inner coil contains 140 turns of wire, has a radius of 0.015 m,

and carries a current of 7.2 A. The outer coil contains 180 turns and has a radius of 0.023 m. What must be the magnitude and direction (relative to the current in the inner coil) of the current in the outer coil, so that the net magnetic fi eld at the common center of the two coils is zero
Physics
1 answer:
Whitepunk [10]3 years ago
8 0

Given Information:  

Current = Ii = 7.2 A

Number of turns inner coil = Ni = 140

Number of turns outer coil = No = 180

Radius inner coil = ri = 0.015 m

Radius outer coil = ro = 0.023 m

Required Information:  

outer coil current = Io = ?

Answer:  

Io = 8.6 A

Step-by-step explanation:  

We have two coils, subscript i denotes inner coil and o denotes the outer coil.

According to the Biot-Savart Law  

B = μ₀IN/2r

we will equate the inner and outer magnetic fields

Bi=Bo

μ₀IiNi/2ri  = μ₀IoNo/2ro

μ₀ and 2 cancels out

Io = Ii*Ni*ro/No*ri

Io = 7.2*140*0.023/180*0.015

Io = 8.6 A

Therefore, a current of 8.6 A is needed to flow in opposite direction so that the magnetic field is opposite and the net magnetic field will be zero.

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a person brings his face close to a mirror . h e finds that the image of his face is magnified write the name of the mirror used
DIA [1.3K]

Answer:

Spherical concave mirrors

Explanation:

Like spherical convex mirrors, spherical concave mirrors have a focus. If the object is closer to the mirror than the focal point is, the image will be virtual, like we talked about before for the plane mirror and the convex mirror.

Concave mirrors, on the other hand, can have real images. If the object is further away from the mirror than the focal point, the image will be upside-down and real---meaning that the image appears on the same side of the mirror as the object.

The closer the object comes to the focal point (without passing it), the bigger the image will be.

You can try this yourself by looking into the concave side of a shiny spoon. If you look into the spoon while holding it at arm’s length, you’ll see an extremely magnified, upside-down image of your face. But as you bring the spoon closer to your eyes, the image will get bigger and bigger.

<em>- Hope this helps! <3</em>

5 0
3 years ago
a 15kg television sits on a shelf at a height of 0.3 m how much gravitational potential energy is added to the television when i
DedPeter [7]

Answer:

<h2>103 Joules</h2>

Explanation:

In this problem we are required to find the potential energy possessed by the television

Given data

mass of television m = 15 kg

height  added above the ground, h= 1-0.3 = 0.7 m

acceleration due to gravity g = 9.81 m/s^2

apply the formula for potential energy we have

P.E= m*g*h

P.E = 15*9.81*0.7 = 103 Joules

7 0
3 years ago
Which of the following is a measure of disorder or randomness
garri49 [273]

<u>Answer</u>:

D. Entropy is a measure of disorder or randomness

<u>Explanation</u>:

The answer is entropy. It is the method to measure any disorder or randomness of any system. Basically it is concept of physics and chemistry but can also be used in other subject matters as well. In formula terms, it is denoted by S and is measurement value is "Joule per kelvin". The values could be both positive and negative as well.

All the other options are incorrect as heat, energy and temperature are the different concepts of science which do not relates with any measurement.

5 0
3 years ago
A wave is moving at the rate of 40 cm/s. Its wavelength is 8 cm. What is the frequency of the wave?
nikitadnepr [17]
<span>v=40 <span><span>cm</span>s</span> speed of wave</span>

<span>λ=8 cm wavelength</span>

<span>f=? frequency of wave</span>

<span>v=λ⋅f</span>

<span>40=8⋅f</span>

<span>f=<span>408</span></span>

<span>f=5 <span>s<span>−<span>1  is the answer </span></span></span></span>
6 0
3 years ago
An atom is chemically stable when it’s outer_____ is completely filled with _____.
Svetlanka [38]

an atom is chemically stable when its outer layer is completely filled with energy. im pretty sure this is right

8 0
3 years ago
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