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Physics
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26 Sep 2019

Out of the following statements which of these are the conditions for electromagnetic induction?

  1. Uniform magnetic field at rest.

  2. No current in the coil.

  3. Continuously increasing and decreasing magnetic field.

  4. Changing the area of the loop.

  5. Change in the orientation of the coil.

 

 

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Bunny Greenfelder
Bunny GreenfelderLv2
25 Feb 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A coil of wire is connected to a power supply, and a currentruns in the coil. A single loop of wire is located near the coil,with its axis on the same line as the axis of the coil. The radiusof the loop is 2 cm.




At time t1 the magnetic field at the center of the loop, due to thecoil, is 0.4 T, in the direction shown in the diagram; the currentin the coil is constant.

(a) What is the absolute value of the magnetic flux through theloop at time t1?
Φ mag = T m2
(b) What approximations or assumptions did you make in calculatingyour answer to part (a)?

Check all that apply.

1.The magnitude of the magnetic field due to the coil is uniformover the area of the loop.
2.The magnetic field outside the loop is zero.
3. The magnetic field due to the coil is uniform in direction overthe area of the loop.


(c) What is the direction of the "curly" electric field inside thewire of the loop at time t1? (Remember that at this time thecurrent in the coil is constant.)
E = 0

At a later time t2, the current in the coil begins todecrease.

(d) Now what is the direction of the "curly" electric field in theloop?
counter-clockwise
At time t2 the rate of change of the magnetic field at the centerof the loop, due to the coil, is -0.36 T/s.
(e) At this time, what is the absolute value of the rate of changeof the magnetic flux through the loop?
|dΦmag/dt| = T m2/s
(f) At this time, what is the absolute value of the emf in theloop?
|emf| = V
(g) What is the magnitude of the electric field at location P,which is inside the wire?
|E| = V/m
(h) Now the wire loop is removed. Everything else remains as it wasat time t2; the magnetic field is still changing at the same rate.What is the magnitude of the electric field at location P?
|E| = V/m

A rectangular coil of wire, 22.0 cm by 35.0 cm and carrying a current of 1.40 A, is oriented with the plane of its loop perpendicular to a uniform 1.50-T magnetic field, as shown in the figure.

uploaded image


a) Calculate the net force which the magnetic field exerts on the coil.

b) Calculate the torque which the magnetic field exerts on the coil.
c) The coil is rotated through a 30.0degrees angle about the axis shown, the left side coming out of the plane of the figure and the right side going into the plane. Calculate the net force which the magnetic field now exerts on the coil.

d) Calculate the torque which the magnetic field now exerts on the coil

How can 2 be correct if 1 is correct?
We apply Lenz's law: The change in magnetic flux must be opposed bythe induced magnetic field.

1- At position number 1 the magnetic field caused by the wire isdirected out of the paper. The coil is moving into an area ofgreater magnetic field and closer to the wire. Thus, the fluxthrough the coil is increasing. According to Lenz's law thisincrease must be countered by the induced field. The direction ofthe induced field as a result goes into the paper. So, the currentin the coil is clockwise.

2- At position number 2 the magnetic field is going into the paperand decreasing as the coil is moving away from the wire. Again,according to Lenz's law the induced magnetic field must counter.Thus the induced field must go into the paper. As a result thecurrent in the coil is clockwise in this case also.

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