Question

Net magnetic field at the center of the circle 'O' due to a current through a loop as shown in figure is:

• A. zero
• B. perpendicular to paper inwards
• C. perpendicular to paper outwards
• D. perpendicular to the paper inwards if $\theta \le {90}^0$ and perpendicular to paper outwards if ${90}^0\le \theta \le {180}^0$

Answer 1

The correct option is C perpendicular to paper outwards

Since the current flowing through the loop as shown in figure is anticlockwise the magnetic field is perpendicular outwards to the plane of paper by the right hand thumb rule.