PHYSICS 3B Chapter Notes - Chapter 28: Magnetic Flux, Cobia

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29 Mar 2020

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" faraday "s law of induction : the emf induced on a circuit is canal of magnetic flux through a single wire loop : to the rate ofchange. Or if a coil is made with n loops of wire : e = Note that the minus sign specifies the direction ofme induced emf : e - Lenz"s law : a arweht produced by induced emf moves in a direction so that the magnetic field it produces tends to restore the changed field as. An induced emf is always in a direction that opposed the original change in flux that combed it. B field induced by a hoop current recall the right hand rule from oh -27. Works land is easier) with a loop in induced emf problems. If the winch is counterclockwise around the loop , Ww versa then b is out the page , and.

Related Questions

A long straight wire carrying a steady current is in the plane of a circular loop of wire.

(a) If the loop is moved closer to the wire, what direction does the induced current in the loop flow?

(b) At one instant, the induced emf in the loop is . What is the rate of change of the magnetic flux through the loop at that instant in webers per second?

tantrout657

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?
Î¦ 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?
|dÎ¦mag/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

Please answer either True or false and explain.

1. A large magnetic flux change through a coil must induce agreater emf in this coil than a small flux change.

2. A circular metal loop surrounds an ideal solenoid such that theplane of the loop is perpendicular to the cylindrical axis of thesolenoid. If the current in the solenoid is steadily increased, noemf is induced in the loop because the magnetic field outside anideal solenoid is zero.

3. When it is connected in a circuit, an inductor must resisthaving current flow through it.

Please explain, thanks

PHYSICS 3B Chapter Notes - Chapter 28: Magnetic Flux, Cobia

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