Practice: An outer ring is connected to a variable voltage source. If the battery’s voltage is continuously INCREASING, what is the direction of the induced current in the inner ring, centered inside of the outer ring?

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Practice: An outer ring is connected to a variable voltage source. If the battery’s voltage is continuously INCREASING, what is the direction of the induced current in the inner ring, centered inside of the outer ring?

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In the figure, a straight wire carries a steady current I. A bar is in contact with a pair of circular rails, and rotates about the straight wire. The induced current through the resistor R is:
A) from b to a
B) zero
C) from a to b

A rectangular coil lies flat on a horizontal surface. A bar magnet is held above the center of the coil with its north pole pointing down. What is the direction of the induced current in the coil?
A) counterclockwise
B) clockwise
C) No current in the coil
D) None of the previous is correct

In Figure 1, two parallel wires carry a current I in opposite directions. A rectangular loop is midway between the wires. The current I is decreasing. The induced current through the resistor R is:
A) from b to a
B) from a to b
C) zero

In the figure, a bar magnet moves away from the solenoid. The induced current through the resistor R is:
A) zero
B) from b to a
C) from a to b

In Figure 1, a battery supplies a steady current to the solenoid on the left. The two solenoids are moving toward each other. The induced current through the resistor R is:
A) from a to b
B) from b to a
C) zero

A long straight wire carries constant current I that is directed toward the left, as shown in the sketch. A small conducting loop is moving away from the wire with constant speed v. The current induced in the loop is
A) zero
B) clockwise
C) counterclockwise

A bar magnet is dropped through a vertical copper tube and is observed to fall very slowly, despite the fact that mechanical friction between the magnet and the tube is negligible. Which of following best explains the reason for this?
A. The falling magnet magnetizes the copper pipe which causes the now permanent copper pipe magnet to attract the falling magnet thus causing the slower descent.
B. The falling magnet is slowed by the Earth’s magnetic field.
C. The changing flux of the falling magnet induces a magnetic field in the copper pipe, in the opposite direction of the bar magnet's field, which impedes the movement through the pipe.
D. Friction and Air resistance cause the magnet to fall much slower than it would outside of the tube.

A single circular loop of wire in the plane of the page is perpendicular to a uniform magnetic field ~B directed into the page, as shown. If the magnitude of the magnetic field is decreasing, then the induced current in the wire loop is
1. counterclockwise around the loop.
2. directed upward out of the paper.
3. zero. (No current is induced.)
4. clockwise around the loop.
5. directed downward into the paper.

An equilateral triangular loop moves into a 0.50 T magnetic field with a constant speed of v = 5 m/s as shown. The loop has sides of length L = 0.50 m, a total resistance of 0.10 Ω, and it enters the field at t = 0 s. What is the direction of the induced current in the loop? Provide a complete justification for your answer.

The magnetic field in the figure is decreasing at the rate of 0.7 T/s.(a) What is the magnitude of the acceleration of a proton at rest at point b? Express your answer as an integer and include the appropriate units.(b) What is the direction of the acceleration of a proton at rest at point b?

The magnetic field in the figure is decreasing at the rate of 0.7 T/s. Protons are at rest at points a, b, c, d.(a) What is the magnitude of the acceleration of a proton at rest at point c? Express your answer as an integer and include the appropriate units.(b) What is the direction of the acceleration of a proton at rest at point c?

The magnetic field in the figure is decreasing at the rate of 0.7 T/s.(a) What is the magnitude of the acceleration of a proton at rest at point d? Express your answer as an integer and include the appropriate units.(b) What is the direction of the acceleration of a proton at rest at point d?

The magnetic field in the figure is decreasing at the rate of 0.7 T/s.(a) What is the magnitude of the acceleration of a proton at rest at point a? Express your answer as an integer and include the appropriate units.(b) What is the direction of the acceleration of a proton at rest at point a?

The current I in the wire in the figure shown is increasing.(a) What is the direction of the induced current in loop A?A. clockwiseB. counterclockwiseC. No current is induced in this loop(b) What is the direction of the induced current in loop B?A. clockwiseB. counterclockwiseC. No current is induced in this loop

The sketch shows the coil lying in the plane of the screen and the external magnetic field pointing into the screen. As the external magnetic field decreases, an induced current flows in the coil. (a) What is the direction of the induced magnetic field caused by this current?(b) What is the direction of the induced current in the wire shown in the picture?A. clockwiseB. counterclockwise

In the sketch to the right, a long straight wire is in the plane of a rectangular conducting wire loop. The current in the straight wire is up. At some point, the current in the straight wire starts to increase in magnitude. This increased current leads to an induced current in the wire loop. a) In which direction will the induced current in the wire loop be? Explain how you reached this conclusion. b) How would your answer be different if the wire loop was on the left side of the wire instead of the right side?

The resistance of the loop in the figure is 0.30 Ω.a) Is the magnetic field strength increasing or decreasing?b) At what rate (T/s)?

A flat, circular, steel loop of radius 75 cm is at rest in a uniform magnetic field, as shown in an edge-on view in the figure. The field is changing with time, according toε(t) = 0.122e-(0.057)tWhen is the induced emf equal to 1/18 of its initial value?

A flat, circular, steel loop of radius 75 cm is at rest in a uniform magnetic field, as shown in an edge-on view in the figure. The field is changing with time, according toFind the direction of the current induced in the loop, as viewed from above the loop.

A 5.0-cm-diameter coil has 20 turns and a resistanceof 0.50 ohms. A magnetic field perpendicular to the coil is B =0.02t + 0.010t2, where B is in tesla and t is in seconds. Find an expression for the induced current I(t)as a function of time.

A conducting loop is halfway into a magnetic field. Supposed the magnetic field begins to increase rapidly in strength. What happens to the loop? Explain your answer fully!a. The loop is pushed upward, toward the top of the page.b. The loop is pushed downward, toward the bottom of the page.c. The loop is pushed to the left, into the magnetic field.d. The loop is pushed to the right, out of the magnetic field.

There is a cw induced current in the conducting loop shown in the figure. Is the magnetic field inside the loop increasing in strength, decreasing in strength, or steady?

A flat, circular, steel loop of radius 75 cm is at rest in a uniform magnetic field, as shown in an edge-on view in the figure. The field is changing with time, according toFind the emf induced in the loop as a function of time (assume t in seconds). Express your answer in terms of the variable t.

What is the direction of the induced current in the circular loop due to the current shown in each part of Fig. 21-10?

There is counterclockwise induced current in the conducting loop shown in Figure Q25.9. Is the magnetic field inside the loop increasing in strength, decreasing in strength, or steady?

A 1.6-m wire is wound into a coil with a radius of 3.2 cm.If this coil is rotated at 93 rpm in a 7.1 × 10−2 T magnetic field, what is its maximum emf?

A long straight wire is in the plane of a rectangular conducting loop. The straight wire initially carries a constant current i in the direction shown. While the current i is being shut off, the current in the rectangle is: A. zeroB. clockwise C. counterclockwise D. clockwise in the left side and counterclockwise in the right side E. counterclockwise in the left side and clockwise in the right side

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