Question

A current is flowing in electricity line towards north, the direction of magnetic field at a point which is just below the line is :

• A. towards north
• B. towards south
• C. towards east
• D. towards west

Answer 1

The correct option is D towards west

Apply thumb rule

According to place you palm on current-carrying conductor and surrounds the conductor with your fingers and your thumb should be in the direction of current flowing

Now at any point, magnetic field lines direction will be same as direction of your fingertips.
So option D