Question

A wire lies in the plane of the paper as shown above. A current I is passing through the wire rightward direction. What is the direction of magnetic field at point A on the page caused by the current?

• A. to the right
• B. to the left
• C. towards the wire
• D. into the page
• E. out of page

Answer 1

The correct option is D into the page

According to thumb rule, when the right hand thumb points towards the current carrying direction, the fingers curl into the direction of the magnetic field around the current carrying conductor.

Clearly at point A, the magnetic field goes into the page.