Electromagnetic induction

A flat, circular loop of radius R is at rest in a uniform magnetic field of magnitude B, as shown in an edge-on view in the figure. How should the loop be rotated to MINIMIZE the magnetic flux through the loop?

( arrow is 60 deg counter clockwise) Rotate the loop 60° counterclockwise.

A flat, circular, metal loop of radius r = 1 m and resistance of 2 Ohms is at rest in a uniform magnetic field of magnitude B. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field increases from 2 T to 6 T in 2 s, what is the magnitude of the induced current in the circular metal loop?

(pi)(A)

A flat, circular loop of radius r = 1 m is at rest in a uniform magnetic field of magnitude B. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field decreases from 8 T to 2 T in 2 s, what is the rate of change in the magnetic flux through the circular loop?

-3(pi) Wb/s

A flat, circular loop of radius r = 1 m is at rest in a uniform magnetic field of magnitude B. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field decreases from 8 T to 2 T in 2 s, what is the rate of change in the magnetic flux through the circular loop? (DOTS)

-3(pi) Wb/s

A flat, circular loop of radius r = 1 m is at rest in a uniform magnetic field of magnitude B. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field increases from 2 T to 6 T in 2 s, what is the rate of change in the magnetic flux through the circular loop?

2 (pi) Wb/s

A flat, circular, metal loop of radius r = 1 m is at rest in a uniform magnetic field of magnitude B. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field increases from 2 T to 6 T in 2 s, what is the magnitude of the induced emf within the circular loop?

2(pi)(V)

A flat, circular loop of radius R is at rest in a uniform magnetic field of magnitude B, as shown in an edge-on view in the figure. What is the magnetic flux through the loop? [Long blue arrows pointing NE at roughly 60deg and arrow from rod pointing 60 deg counter clockwise]

B(pi)R^2 squared(cos30deg)

A U-shaped conductor lies perpendicular to a uniform magnetic field B, directed into the page. A metal rod with length L lies across the two arms of the conductor, forming a conducting loop, as shown in the figure. The metal rod is moved to the right at a constant speed v, while remaining in contact with the U-shaped conductor. If the resistance in the U-shaped conductor and the metal rod is R, what is the MAGNITUDE OF THE INDUCED CURRENT\in the loop?

I=(BLv)/R

A flat, circular loop of radius R is at rest in a uniform magnetic field of magnitude B, as shown in an edge-on view in the figure. How should the loop be rotated to MAXIMIZE the magnetic flux through the loop?

Rotate the loop 30° clockwise.

A flat, circular loop of radius R is at rest in a uniform magnetic field of magnitude B, as shown in an edge-on view in the figure. How should the loop be rotated to MAXIMIZE the magnetic flux through the loop? (long blue arrows at 60deg clockwise, green arrow at 60deg counter clockwise)

Rotate the loop 30° clockwise.

A flat, circular loop of radius R is at rest in a uniform magnetic field of magnitude B, as shown in an edge-on view in the figure. How should the loop be rotated to MINIMIZE the magnetic flux through the loop?

Rotate the loop 60° counterclockwise.

A flat, circular wire loop of radius r is at rest in a uniform magnetic field of magnitude B that extends far beyond the edge of the loop. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. Which of the following will cause an emf to be induced in the loop?

Rotate the loop so that the plane of the loop is perpendicular to the page.

A very long, straight wire carries a steady current, I, to the left, as shown in the figure. Near the wire, but not touching it, is a circular copper-wire loop that is oriented with its plane parallel to the page. If the current in the long straight wire INCREASES by 1 A/s, what is true about the current induced in the circular loop? (I is pointing left, rod is floating above ring)

The induced current in the circular loop flows clockwise.

A very long, straight wire carries a steady current, I, to the left, as shown in the figure. Near the wire, but not touching it, is a circular copper-wire loop that is oriented with its plane parallel to the page. If the current in the long straight wire increases by 1 A/s, what is true about the current induced in the circular loop?

The induced current in the circular loop flows clockwise.

A very long, straight wire carries a steady current, I, to the left, as shown in the figure. Near the wire, but not touching it, is a circular copper-wire loop that is oriented with its plane parallel to the page. If the current in the long straight wire increases by 1 A/s, what is true about the current induced in the circular loop? (I moving left above ring, not touching)

The induced current in the circular loop flows clockwise.

A very long, straight wire carries a steady current, I, to the left, as shown in the figure. Near the wire, but not touching it, is a circular copper-wire loop that is oriented with its plane parallel to the page. If the circular loop IS PULLED AWAY FROM THE WIRE, while keeping the loop's orientation the same, what is true about the induced current in the circular loop? [ I arrow pointing left, rod above ring,

The induced current in the circular loop flows counterclockwise.

A U-shaped conductor lies perpendicular to a uniform magnetic field B, directed into the page. A metal rod with length L lies across the two arms of the conductor, forming a conducting loop, as shown in the figure. The metal rod is moved to the right at a constant speed, while remaining in contact with the U-shaped conductor. WHAT IS TRUE about the INDUCED CURRENT in the loop? (green arrow moving right)

The induced current in the loop flows counterclockwise at a constant rate.

A U-shaped conductor lies perpendicular to a uniform magnetic field B, directed into the page. A metal rod with length L lies across the two arms of the conductor, forming a conducting loop, as shown in the figure. The metal rod is moved to the right at a constant speed, while remaining in contact with the U-shaped conductor. What is true about the induced CURRENT in the loop? (V is pointing right)

The induced current in the loop flows counterclockwise at a constant rate.

A flat, circular, copper loop of radius r is at rest in a uniform magnetic field of magnitude B that extends far beyond the edge of the loop. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and into the page, as indicated by the blue X's. If the magnitude of the magnetic field is decreased at a rate of 1 T/s, what is true about the induced current in the copper loop? (X's)

The induced current is constant and flows clockwise around the copper loop.

A flat, circular, copper loop of radius r is at rest in a uniform magnetic field of magnitude B that extends far beyond the edge of the loop. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field is increased at a rate of 1 T/s, what is true about the induced current in the copper loop?

The induced current is constant and flows clockwise around the copper loop.

A flat, circular, copper loop of radius r is at rest in a uniform magnetic field of magnitude B that extends far beyond the edge of the loop. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field is increased at a rate of 1 T/s, what is true about the induced current in the copper loop? (DOTS)

The induced current is constant and flows clockwise around the copper loop.

A flat, circular, copper loop of radius r is at rest in a uniform magnetic field of magnitude B that extends far beyond the edge of the loop. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and into the page, as indicated by the blue X's. If the magnitude of the magnetic field is increased at a rate of 1 T/s, what is true about the induced current in the copper loop?

The induced current is constant and flows counterclockwise around the copper loop.

A flat, circular, copper loop of radius r is at rest in a uniform magnetic field of magnitude B that extends far beyond the edge of the loop. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field is decreased at a rate of 1 T/s, what is true about the induced current in the copper loop?

The induced current is constant and flows counterclockwise around the copper loop.

A flat, circular, copper loop of radius r is at rest in a uniform magnetic field of magnitude B that extends far beyond the edge of the loop. The plane of the loop is parallel to the page and the magnetic field is directed perpendicular to and out of the page, as indicated by the blue dots. If the magnitude of the magnetic field is decreased at a rate of 1 T/s, what is true about the induced current in the copper loop? (DOTS)

The induced current is constant and flows counterclockwise around the copper loop.

A thin metal rod of length L moves at a constant speed v in a uniform magnetic field of magnitude B, as shown in the figure. What is the induced emf in the rod?

The induced emf has a magnitude of BLv and is directed from a to b.

A thin metal rod of length L moves at a constant speed v in a uniform magnetic field of magnitude B, as shown in the figure. What is the induced emf in the rod? (everything moving left, green arrow poiting down, rod tilted NE)

The induced emf has a magnitude of BLv and is directed from a to b.

A U-shaped conductor lies perpendicular to a uniform magnetic field B, directed into the page. A metal rod with length L lies across the two arms of the conductor, forming a conducting loop, as shown in the figure. The metal rod is moved to the right at a constant speed, while remaining in contact with the U-shaped conductor. What is true about the induced magnetic FORCE on the metal rod?

The induced force on the metal rod points to the left.

A U-shaped conductor lies perpendicular to a uniform magnetic field B, directed into the page. A metal rod with length L lies across the two arms of the conductor, forming a conducting loop, as shown in the figure. The metal rod is moved to the right at a constant speed, while remaining in contact with the U-shaped conductor. What is true about the INDUCED MAGNETIC FIELD within the area enclosed by the loop? (Xs, pointing right)

The induced magnetic field points in the opposite direction to the external magnetic field.

A rectangular metal loop is dropped between the North pole of one magnet and the South pole of another magnet, as shown in the figure. What is true about the acceleration of the loop while it falls between the poles of the magnets?

The loop falls with an acceleration that is less than g.

A bar magnet is dropped above the center of a circular metal loop such that the magnet falls through the center of the loop. What is true about the acceleration of the magnet as it falls through the loop?

The magnet falls with an acceleration that is less than g.

A rectangular wire loop is pulled out of a region of uniform magnetic field B at a constant speed v. What is true about the magnetic flux through the loop while the loop is pulled out of the region of uniform magnetic field?

The magnetic flux through the loop decreases at a constant rate as the loop is moved to the right.

A long, straight wire carries constant current I. A metal bar with length L is moving below the wire at constant velocity v, as shown in the figure. Point a is a distance d from the wire. Which point on the metal bar is at highest potential?

The top of the bar (point a) is at highest potential. (v is pointing right, I is pointing right)

A rectangular wire loop is pulled out of a region of uniform magnetic field B at a constant speed v. What is true about the induced emf in the loop while the loop is pulled out of the region of uniform magnetic field?

There is a constant emf induced in the loop.

A very long, straight wire carries a steady current, I, to the left, as shown in the figure. Near the wire, but not touching it, is a circular copper-wire loop that is oriented with its plane parallel to the page. If the circular loop is pulled to the right along the direction of the wire, while keeping the loop's orientation the same, what is true about the induced current in the circular loop?

There is no induced current in the circular loop.