Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.

Homework Help

Lesson: Electromagnetic Induction

In this lesson, we will learn how to describe the electric current induced in a wire that is placed in a changing magnetic field.

Sample Question Videos

04:60

Worksheet • 8 Questions • 1 Video

Q1:

The diagram shows a permanent magnet being moved through a loop of copper wire. This motion induces an electric current in the wire.

Which of the following correctly describes how the current within the wire can be increased?

  • AThe current in the wire can be increased by moving the magnet through the loop faster.
  • BThe current in the wire can be increased by increasing the thickness of the wire.
  • CThe current in the wire can be increased by reversing the direction of the motion of the magnet while keeping the wire in the same position.
  • DThe current in the wire can be increased by increasing the radius of the wire loop.
  • EThe current in the wire can be increased by moving the wire at the same speed and in the same direction as the magnet.

Which of the following correctly describes how the current within the wire can be reversed?

  • AThe current in the wire can be reversed by reversing the direction of motion of the magnet while keeping the wire in the same position.
  • BThe current in the wire can be reversed by moving the wire at the same speed and in the same direction as the magnet.
  • CThe current in the wire can be reversed by moving the magnet through the loop faster.
  • DThe current in the wire can be reversed by moving the magnet past the outside of the wire loop.
  • EThe current in the wire can be reversed by rotating the loop about its axis as the magnet passes through it.

What would be the effect of keeping the magnet still and moving the loop of wire toward it so that the magnet passes through it?

  • AThe current in the wire would be reversed.
  • BThe same current would be induced in the wire.
  • CThe current in the wire would be zero.

What would be the effect of turning the magnet around so that the south pole of the magnet goes through the loop first?

  • AThe same current would be induced in the wire.
  • BThe current would be reversed.
  • CThe current in the wire would be zero.

Q2:

Parts (a), (b), (c), and (d) in the diagram show a straight piece of copper wire moving through a magnetic field. The magnetic field is uniform, and in each part the wire is moving at the same speed, but in a different direction through the magnetic field. Which of (a), (b), (c), and (d) shows the motion of the wire that would lead to the greatest potential difference being induced in it?

  • A(c)
  • B(a)
  • C(d)
  • D(b)

Q3:

Parts (a), (b), (c), and (d) in the diagram show a straight piece of copper wire moving through a magnetic field. The magnetic field is uniform, and in each part the wire is moving in a different direction through the magnetic field. Which of (a), (b), (c), and (d) show a motion of the wire that would lead to an electric potential difference being induced in it?

  • A(a) and (d)
  • B(b) and (d)
  • C(a) and (b)
  • D(c) and (d)
  • E(a) and (c)
Preview

Related Lessons

Related Videos

Related Worksheets