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A solenoid produces a magnetic field when an electric current passes through it.

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Question: A solenoid produces a magnetic field when an electric current passes through it. What happens to the magnetic field if the current is reversed?

Options:

  1. The magnetic field disappears
  2. The magnetic field direction reverses
  3. The magnetic field strength increases
  4. The magnetic field strength decreases

Correct Answer: The magnetic field direction reverses

Solution: 

Reversing the current in a solenoid reverses the direction of the magnetic field according to the right-hand rule.

A solenoid produces a magnetic field when an electric current passes through it.

Practice Questions

Q1
A solenoid produces a magnetic field when an electric current passes through it. What happens to the magnetic field if the current is reversed?
  1. The magnetic field disappears
  2. The magnetic field direction reverses
  3. The magnetic field strength increases
  4. The magnetic field strength decreases

Questions & Step-by-Step Solutions

A solenoid produces a magnetic field when an electric current passes through it. What happens to the magnetic field if the current is reversed?
  • Step 1: Understand what a solenoid is. A solenoid is a coil of wire that creates a magnetic field when electricity flows through it.
  • Step 2: Know that when electric current flows through the solenoid, it creates a magnetic field around it.
  • Step 3: Learn about the right-hand rule. This rule helps you determine the direction of the magnetic field. If you curl the fingers of your right hand in the direction of the current, your thumb points in the direction of the magnetic field.
  • Step 4: When the current is reversed, it means the flow of electricity changes direction.
  • Step 5: Apply the right-hand rule again. If you now curl your fingers in the new direction of the current, your thumb will point in the opposite direction of the magnetic field.
  • Step 6: Conclude that reversing the current in the solenoid reverses the direction of the magnetic field.
  • Electromagnetism – The relationship between electric current and magnetic fields, specifically how a solenoid generates a magnetic field when current flows through it.
  • Right-Hand Rule – A mnemonic used to determine the direction of the magnetic field around a current-carrying conductor.
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