Chapter 20 questions

Question 1

Current is generated by ___________ magnetic field

Answer 1

change in a

Question 2

A bar magnet is falling toward the center of a loop of wire, with the north pole pointed downwards. Viewed from the same side of the loop as the magnet, as the north pole approaches the loop, what is the direction of the induced current?

Answer 2

counterclockwise

Question 3

two circular loops are side by side and lie in the xy plane. A switch is closed, starting a counterclockwise current in the left had loop, as viewed from the positive z axis passing through the center of the loop. Which of the following statements is true of the right hand loops in a steady-state situation?

Answer 3

The current remains zero

Question 4

a horizontal metal bar is oriented east-west drops straight down in a location where earth’s magnetic field is due north. As a result, and emf develops between the ends. Which end is positively charged?

Answer 4

The east end

Question 5

You intend to move a rectangular loop of wire into a region of uniform magnetic field at a given speed so as to induce an EMF in the loop. The plane of the loop must remain perpendicular to the magnetic field lines. In which orientation should you hold the loop while you move it into the region with the magnetic field in order to generate the largest emf?

Answer 5

with the short dimension of the loop parallel to the velocity vector

Question 6

When you see this card, go look at the chapter 20 image based questions

Question 7

A loop of wire is placed in a uniform magnetic field. For what orientation of the loop is the magnetic flux a maximum?

Answer 7

the plane of the loop is perpendicular to the magnetic field

Question 8

A loop of wire is placed in a uniform magnetic field. For what orientation is the flux zero?

Answer 8

The plane of the loop is parallel to the magnetic field