1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Stolb23 [73]
3 years ago
12

A single-turn circular loop of radius 14 cm is to produce a field at its center that will just cancel the earth's magnetic field

at the equator, which is 0.7 g directed north. the permeability of free space is 4 π × 10−7 t · m/a. find the current in the loop. answer in units of a
Physics
1 answer:
Olin [163]3 years ago
6 0

Answer:

49 A

Explanation:

We are given that

Number of turns,N=1

Radius,r=14 cm=\frac{14}{100}=0.14 m

1 m=100 cm

Magnetic field,B=0.7 G=0.7\times 10^{-4} T

1G=10^{-4} T

\mu_0=4\pi\times 10^{-7} Tm/A

We know that magnetic field

B=\frac{\mu_0IN}{2\pi r}

Substitute the values

0.7\times 10^{-4}=\frac{4\pi\times 10^{-7}\times 1\times I}{2\pi\times 0.14}

I=\frac{0.7\times 10^{-4}\times 2\pi\times 0.14}{4\pi\times 10^{-7}\times 1}

I=49A

You might be interested in
For what absolute value of the phase angle does a source deliver 71 % of the maximum possible power to an RLC circuit
kherson [118]

Answer: the absolute value of the phase angle is 28°

Explanation:

taking a look at expression for the instantaneous electric power in an AC circuit;

P = VI -------let this be equation 1

p is power, v is voltage and I is current;

for maximum power

P_max = V_rms × I_rms --------let this be equ 2

where P_max is the maximum power, V_rms is the rms value of voltage and I_rms is the rms value of current.

Also for average electric power in an AC circuit

P_avg = V_rms × I_rms × cos²∅ -------let this be equ 3

where P_avg is the average power and cos∅ is the power factor

now from equation 2;  P_max = V_rms × I_rms

so p_max replaces V_rms × I_rms in equation 3

we now have

P_avg = P_max × cos²∅

so we substitute

expression for the given value of the average power is

P_avg = P_max × 75%

p_avg = P_max.78/100

for the expression of the average electricity in an AC circuit

P_max.78/100 = P_max × cos²∅

78/100 = cos²∅

to get the absolute value of phase angle

∅ = cos⁻¹ ( √(78/100))

∅ =  cos⁻¹ ( 0.8832)

∅ = 27.969 ≈ 28°

Therefore the absolute value of the phase angle is 28°

8 0
3 years ago
How can you change the phases of matter using thermal energy
Leokris [45]

Answer:

These energy exchanges are not changes in kinetic energy. They are changes in bonding energy between the molecules. If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance.

8 0
3 years ago
If the same experiment is repeated in different parts of the world by different scientists,
Misha Larkins [42]
The answer is D) The outcome of the experiment will be non observable
3 0
3 years ago
Read 2 more answers
While performing an experiment, the student creating the data table is not sure if a measurement from the experiment is a vector
marin [14]

Before coming into conclusion first we have to understand both scalar and vector .

A scalar quantity is a physical quantity which has only magnitude for it's complete specification.

A vector quantity is that physical quantity which not only requires magnitude but also possesses direction for it's complete specification.

So the most important factor that differentiate vector from scalar is the direction.

As per the question the student is doing an experiment where he is recording the data obtained during the process.

In order to arrange them in data table, he should ask about the direction of the quantity under consideration.


Hence the correct option is the third option(C)i.e does the measurement include direction?




7 0
3 years ago
Read 2 more answers
High energy waves have short wave lengths, true or false?
Anna71 [15]
True, the wavelength dies down due to high frequency and low amptitude. 
5 0
3 years ago
Other questions:
  • A person walks first at a constant speed of 5.10 m/s along a straight line from point circled a to point circled b and then back
    12·1 answer
  • When are the two days of equinox
    11·2 answers
  • Which nutrient is the first (easiest) to be broken down and absorbed for energy use in the body? Water Carbohydrates Fats Protei
    8·1 answer
  • Please help!!!!!!!!!
    12·1 answer
  • You hold a metal block of mass 40 kg above your head at a height of 2 m.
    7·1 answer
  • In most cases, how many electrons does it take to completely fill the
    10·1 answer
  • Explain why a magnet from your refrigerator could not be used to life something as heavy as a car ?
    14·1 answer
  • Find the acceleration of the system and the tension in the ropes for the system shown. The table mass is 30 kg and the hanging m
    7·1 answer
  • Guys helppppp pleaseeeeeeeee
    5·1 answer
  • Llammmmaaaa or chickennnss?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!