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In a closed loop, if the net current is zero, what can be said about the magneti

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Question: In a closed loop, if the net current is zero, what can be said about the magnetic field according to Ampere\'s Law?

Options:

  1. The magnetic field is zero everywhere
  2. The magnetic field is uniform
  3. The magnetic field can be non-zero
  4. The magnetic field is only zero at the center

Correct Answer: The magnetic field can be non-zero

Solution: 

According to Ampere\'s Law, if the net current through a closed loop is zero, the line integral of the magnetic field around that loop is also zero, but the magnetic field can still be non-zero in some regions.

In a closed loop, if the net current is zero, what can be said about the magneti

Practice Questions

Q1
In a closed loop, if the net current is zero, what can be said about the magnetic field according to Ampere's Law?
  1. The magnetic field is zero everywhere
  2. The magnetic field is uniform
  3. The magnetic field can be non-zero
  4. The magnetic field is only zero at the center

Questions & Step-by-Step Solutions

In a closed loop, if the net current is zero, what can be said about the magnetic field according to Ampere's Law?
Correct Answer: Magnetic field can be non-zero in some regions.
  • Step 1: Understand what a closed loop is. A closed loop is a complete path where you can go around without any breaks.
  • Step 2: Know what net current means. Net current is the total amount of electric current flowing into the loop minus the total current flowing out.
  • Step 3: If the net current is zero, it means that the total current entering the loop is equal to the total current leaving the loop.
  • Step 4: Learn about Ampere's Law. Ampere's Law relates the magnetic field around a closed loop to the current passing through that loop.
  • Step 5: According to Ampere's Law, if the net current through a closed loop is zero, the line integral of the magnetic field around that loop is also zero.
  • Step 6: This means that when you measure the magnetic field around the loop, the total effect cancels out to zero.
  • Step 7: However, even if the total around the loop is zero, the magnetic field can still exist in some areas inside or outside the loop.
  • Ampere's Law – Ampere's Law relates the magnetic field around a closed loop to the net current passing through that loop.
  • Magnetic Field Behavior – The magnetic field can exist in regions even if the net current through a closed loop is zero.
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