Mini-Quiz: Solenoids are Electromagnetic Devices

1. What does wrapping the electric wire in a helix do to the magnetic field?

   It causes the field to be circularSorry, not correct. Try another button. Nothing happens until an iron core is addedGood try, but not right. Select another answer. It concentrates the field and directs it toward the helix endsThat is correct. You know about solenoids.

2. How does a solenoid switch work?

   A magnet can be drawn into the solenoid, breaking electrical contactCorrect. You are an electromagnetic genius! The helix of the solenoid switches electricity on and offOops! Wrong answer. Re-read the question and try again. The magnetic filled can affect nearby switches to turn them offSorry, not correct. Try another button.

3. What happens to the magnetic field when an iron rod is placed in the solenoid?

   The field greatly increasesThat is correct. You know about solenoids. The field is neutralizedGood try, but not right. Select another answer. It depends on how long the rod is in the solenoidOops! Wrong answer. Re-read the question and try again.

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