Skip to ContentGo to accessibility pageKeyboard shortcuts menu
OpenStax Logo
College Physics for AP® Courses 2e

Test Prep for AP® Courses

College Physics for AP® Courses 2eTest Prep for AP® Courses

23.1 Induced Emf and Magnetic Flux

1.

To produce current with a coil and bar magnet you can:

  1. move the coil but not the magnet.
  2. move the magnet but not the coil.
  3. move either the coil or the magnet.
  4. It is not possible to produce current.
2.

Calculate the magnetic flux for a coil of area 0.2 m2 placed at an angle of θ=60º (as shown in the figure above) to a magnetic field of strength 1.5×10-3 T. At what angle will the flux be at its maximum?

23.5 Electric Generators

3.

The emf induced in a coil that is rotating in a magnetic field will be at a maximum when

  1. the magnetic flux is at a maximum.
  2. the magnetic flux is at a minimum.
  3. the change in magnetic flux is at a maximum.
  4. the change in magnetic flux is at a minimum.
4.

A coil with circular cross section and 20 turns is rotating at a rate of 400 rpm between the poles of a magnet. If the magnetic field strength is 0.6 T and peak voltage is 0.2 V, what is the radius of the coil? If the emf of the coil is zero at t = 0 s, when will it reach its peak emf?

23.7 Transformers

5.

Which of the following statements is true for a step-down transformer? Select two answers.

  1. Primary voltage is higher than secondary voltage.
  2. Primary voltage is lower than secondary voltage.
  3. Primary current is higher than secondary current.
  4. Primary current is lower than secondary current.
6.

An ideal step-up transformer with turn ratio 1:30 is supplied with an input power of 120 W. If the output voltage is 210 V, calculate the output power and input current.

23.8 Electrical Safety: Systems and Devices

7.

Which of the following statements is true for an isolation transformer?

  1. It has more primary turns than secondary turns.
  2. It has fewer primary turns than secondary turns.
  3. It has an equal number of primary and secondary turns.
  4. It can have more, fewer, or an equal number of primary and secondary turns.
8.

Explain the working of a ground fault interrupter (GFI).

PreviousNext
Order a print copy
Citation/Attribution

This book may not be used in the training of large language models or otherwise be ingested into large language models or generative AI offerings without OpenStax's permission.

Want to cite, share, or modify this book? This book uses the Creative Commons Attribution License and you must attribute OpenStax.

Attribution information
  • If you are redistributing all or part of this book in a print format, then you must include on every physical page the following attribution:
    Access for free at https://openstax.org/books/college-physics-ap-courses-2e/pages/1-connection-for-ap-r-courses
  • If you are redistributing all or part of this book in a digital format, then you must include on every digital page view the following attribution:
    Access for free at https://openstax.org/books/college-physics-ap-courses-2e/pages/1-connection-for-ap-r-courses
Citation information

© Jul 9, 2024 OpenStax. Textbook content produced by OpenStax is licensed under a Creative Commons Attribution License . The OpenStax name, OpenStax logo, OpenStax book covers, OpenStax CNX name, and OpenStax CNX logo are not subject to the Creative Commons license and may not be reproduced without the prior and express written consent of Rice University.