Chapter 30, Concept Question 04 The figure shows two circuits in which a conducting bar is slid at the same speed v through the same uniform magnetic field and along a U- shaped wire. The parallel lengths of the wire are separated by 2L in circuit 1 and by L in circuit 2. The current induced in circuit 1 is counterclockwise. (2) Is the magnetic field into or out of the page? Into Out of Is the current induced in circuit 2 clockwise or counterclockwise? Counterclockwise Clockwise Is the emf induced in circuit 1 larger than, smaller than, or the same as that n circuit 2? Larger The same as Smaller

6. Two moving rods of equal lengths (1.30 m) are moving as shown in the figure. The speed v₁ = 1.10 m/s and the speed V₂ = 1.40 m/s. If the magnetic field is uniform with a magnitude of 0.90 T, what is the magnitude of the average emf in the loop? What is the direction of the induced current in the circuit? O V Counterclockwise None of these Clockwise

QUESTION 23 In generating electricity, a magnet, surrounded by wires connected to the electrical grid, will be made to spin, using wind, a steam turbine, or moving water. Which answer best explains what is happening in the wires during this process.   a. The magnet does not need to move, and still has the capability to make electrons move in the wires that surround it.   b. An induced voltage and current flow is set up in the wires surrounding a magnet due to changes in magnetic temperature.   c. A magnetic field surrounds the rotating magnet, pushes on the electrons in the wires, thus giving those electrons energy per charge (voltage).   d. Light from the magnet is able to push electrons out of the material that makes up the wires. In so doing, the wires are made to have a flowing electrical current.

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QUESTION 6 A long, thin wire is made into circular loop that lies flat in the x-y plane. A magnetic field points in the positive x (i) direction and is increasing. Which of the following statements are true regarding the resulting current in the loop? The current will flow clockwise O current will not flow O The current will alternate between clockwise and counter clockwise The current will flow counter clockwise QUESTION 7 A long, thin wire is made into a loop that lies flat in the x-y plane. A decreasing magnetic field points in the negative y (-j) direction. Which of the following statements are true regarding the resulting current in the loop. O current will alternate between clockwise and counter clockwise O The current flows clockwise O current will not flow The current flows counter clockwise

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19. A square conducting loop of side a and resistance R passes through a region of space that has uniform magnetic field B into the page, as shown in the figure. Assume that the speed of the loop is constant throughout its motion. What is the magnitude and direction of the current in the loop: as it enters the magnetic field, a) b) while travelling inside the magnetic field, as it leaves the magnetic field. Provide your answer symbolically. a V Ø 8 Ø Top view Uniform magnetic field pointing into the page

When you move a magnet through a 1 loop coil you detect a voltage of 0.001 volts, what voltage would you read if you move the same magnet at the same velocity through a coil with 1000 loops (assume the radius of the loops in the coil is the same as the one in the single loop wire)

A portion of a loop of wire passes between the poles of a magnet as shown. We are viewing the circuit from above. When the switch is closed and a current passes through the circuit, what is the movement, if any, of the wire between the poles of the magnet? switch P S B N The wire moves upwards (towards us) The wire moves towards the south pole of the magnet It doesn't move The wire moves inwards (away from us) The wire moves towards the north pole of the magnet

The figure shows a uniform magnetic field that is normal to the plane of the conducting loop of resistance R. Note: the area of the non- circular portion of the circuit is negligible compared to that of the loop. B 04 Which entry in the table below correctly pairs the change in the system with the direction of the induced current through R? change in the system direction of current through R decrease the area of the loop rotate loop into the paper decrease the magnitude of B increase the area of the loop pull loop to the right from top toward bottom no induced current from bottom toward top from bottom toward top from top toward bottom