Question

Two equal electric currents are flowing perpendicular to each other as shown in figure. AB and CD are perpendicular to each other and symmetrically placed with respect to the currents. Where do we expect the resultant magnetic field to be zero?

• A. on AB
• B. on CD
• C. on both AB & CD
• D. on both OD & BO

Answer 1

The correct option is A on AB

The direction of the magnetic field due to a current is given by right hand curled fingers rule.

Therefore at AB axis, the components of magnetic field will cancel each other and the resultant magnetic field will be zero on AB.