8.02 Lecture Notes - Lecture 1: Electric Potential

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amethystmuskrat145

13 Apr 2016

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While a rectangular wire loop is pulled upward through a uniform magnetic eld b eld penetrating its bottom half, as shown, there is a current in the loop. Electric current i: charge q owing across area a at time t. A magnet has two poles, north and south. Magnetic eld lines leave from the north end and go to the south end. The iron lings represent the magnetic eld present at the instant you stopped the magnet. The direction of the magnetic eld is along the direction of the iron lings. Product of perpendicular component of magnetic eld and area. Imagine a charge q moving around a closed path under the action of a force f. Then the work done per unit charge is called the electromotive force. Has the same dimensions as the electric potential so si unit is the volt.

Related Questions

you hold a wire coil so that the plane of the coil is perpendicular to a magnetic field b⃗ .

A circular loop of wire lies flat on a level tabletop. A bar magnet is held stationary above the circular loop with its north pole point downward. As viewed from above, in what direction does the induced current flow in the loop of wire?
1. No current is induced in the loop of wire.
2. An induced current flows clockwise in the loop of wire.
3. An induced current flows counterclockwise in the loop of wire.
4. The direction of the induced current cannot be determined from the given information.

redweasel197

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

8.02 Lecture Notes - Lecture 1: Electric Potential

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