Question

A circular loop of wire has current going through it in the clockwise direction.
What is the direction of the magnetic field that is caused by this current through the wire?

• A. Inside the loop: out of the screen
  Outside the loop: into the screen
• B. Inside the loop: out of the screen
  Outside the loop: out of the screen
• C. Inside the loop: into the screen
  Outside the loop: out of the screen
• D. Inside the loop: into the screen
  Outside the loop: into the screen

Answer 1

The correct option is C Inside the loop: into the screen

Outside the loop: out of the screen
Using right hand thumb rule, the direction of magnetic field lines due the current in circular is shown in the figure.

Thus the magnetic field at any point P inside the loop points into the screen whereas at any point q outside the loop points out of the screen.

Hence option C is correct.