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A long straight wire carries a current I. What is the direction of the magnetic

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Question: A long straight wire carries a current I. What is the direction of the magnetic field at a point located directly above the wire? (2020)

Options:

  1. Towards the wire
  2. Away from the wire
  3. Clockwise
  4. Counterclockwise

Correct Answer: Away from the wire

Exam Year: 2020

Solution: 

Using the right-hand rule, the magnetic field direction at a point above the wire is away from the wire.

A long straight wire carries a current I. What is the direction of the magnetic

Practice Questions

Q1
A long straight wire carries a current I. What is the direction of the magnetic field at a point located directly above the wire? (2020)
  1. Towards the wire
  2. Away from the wire
  3. Clockwise
  4. Counterclockwise

Questions & Step-by-Step Solutions

A long straight wire carries a current I. What is the direction of the magnetic field at a point located directly above the wire? (2020)
  • Step 1: Identify the direction of the current in the wire. Let's say the current is flowing upwards.
  • Step 2: Use your right hand to apply the right-hand rule. Point your thumb in the direction of the current (upwards).
  • Step 3: Curl your fingers around the wire. Your fingers will show the direction of the magnetic field lines.
  • Step 4: Look at the point directly above the wire. Your fingers will be pointing away from the wire at that point.
  • Step 5: Conclude that the direction of the magnetic field at the point above the wire is away from the wire.
  • Magnetic Field Around a Current-Carrying Wire – The magnetic field generated by a long straight wire carrying an electric current can be determined using the right-hand rule, which states that if you point your thumb in the direction of the current, your fingers will curl in the direction of the magnetic field lines.
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