Worksheet: Magnetic Fields Produced by Electric Currents

In this worksheet, we will practice describing the magnetic field that is produced by a wire carrying an electric current.

Q1:

For the magnetic field created around a current-carrying wire, the the current, the the magnetic field.

  • Asmaller, stronger
  • Blarger, weaker
  • Clarger, stronger

Q2:

Which of the following correctly describes what is meant by a “hard magnetic material”?

  • AA hard magnetic material is a material which is magnetic but not malleable.
  • BA hard magnetic material is a material which loses its induced magnetism quickly.
  • CA hard magnetic material is a material which is magnetic and has a high melting point.
  • DA hard magnetic material is a material which does not lose its induced magnetism easily.
  • EA hard magnetic material is a material which has a high density.

Q3:

Which of the following correctly describes what is meant by a “soft magnetic material”?

  • AA soft magnetic material is a material which is both magnetic and highly malleable.
  • BA soft magnetic material is a material which loses its induced magnetism slowly.
  • CA soft magnetic material is a material which is relatively abundant in Earth’s crust.
  • DA soft magnetic material is a material which loses its induced magnetism quickly.
  • EA soft magnetic material is a material which has a low density.

Q4:

Which of the following materials would be a good material to use as the core of an electromagnet?

  • APlastic
  • BWood
  • CGlass
  • DIron
  • ESilicon

Q5:

Which two of the following are ways to increase the strength of the magnetic field created by a solenoid?

  1. Increasing the width of the solenoid
  2. Decreasing the length of the solenoid
  3. Increasing the current through the solenoid
  4. Decreasing the number of turns in the solenoid
  5. Adding an iron core to the solenoid
  • Aa and e
  • Bc and a
  • Ca and b
  • Dc and e
  • Ed and b

Q6:

Which of the following is the correct description of a solenoid?

  • AA solenoid is a single loop of insulated wire. Passing an electric current through it creates a magnetic field similar to that of a bar magnet.
  • BA solenoid is a single straight piece of wire. Passing an electric current along it creates a magnetic field around it.
  • CA solenoid is a long coil of insulated wire. Passing an electric current through it creates a magnetic field similar to that of a bar magnet.

Q7:

Which of the four diagrams correctly shows the field lines of the magnetic field created around a current-carrying wire?

  • Ab
  • Ba
  • Cd
  • Dc

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