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PHYS 102 Lecture Notes - Lecture 21: Provatas

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ivorylion930
1 May 2016
School
McGill University
Department
Physics
Course
PHYS 102
Professor
Nick Provatas

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PHYS 102 Full Course Notes
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PHYS 102 Full Course Notes
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Document Summary

Example 1c: what is the magnetic flux in the loop below, bacos(theta) as b and plane of a have to be perpendicular. Question 2: consider square loop with total area a and a magnetic field of strength b occupying space as shown. What is the total magnetic flux through the loop: 0 (now there is magnetic field on both sides but flux cancel out b*a/2 - b*a/2) Faraday"s law of induction: magnitude of induced emf, the rate of change of magnetic flux through closed circuit induces an emf in the circuit o o. Sign is super important as it indicates the direction of induced emf. Physics 102 (provatas) - t/r 11:35-12:55 o: closed loop and flux going through it are analyzed o, 1) the b-field (change in b over change in time) Induced emf caused by changes in flux in any of the following ways. Take magnetic field given perpendicular to the plane of the hoop.

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Related textbook solutions

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

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Related Questions

A loop wire with radius r =0.015m is in a magnetic field with magnitude B as shown in the figure. 

B changes from B1 =0.55T to B2 = 6.5T in at a constant rate. The resistance of the wire R = 5 ohm. 

a) Express the magnetic flux  going through a loop of radius r assuming a constant magnetic field B. 

b) Express the magnetic flux change, in terms of B1 and B2 and r.

c) Calculate the numerical value of in T-m2.

d) Express the magnitude of the average emf E induced in the loop in terms of and .

The rotating loop in an AC generator is a square 10.0 cm on each side. It is rotated at 60.0 Hz in a uniform magnetic field of 0.800 T. Calculate (a) the flux through the loop as a function of time, (b) the emf induced in the loop, (c) the current induced in the loop for a loop resistance of , (d) the power delivered to the loop, and (e) the torque that must be exerted to rotate the loop.

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