Question

How is a uniform magnetic field in a given region represented ? Draw a diagram in support of your answer.

A uniform magnetic field exists in the plane of paper as shown in the diagram. In this field, an electron (e⁻) and a positron (p⁺) enter as shown. The electron and positron experience forces :

A rectangular loop ABCD carrying a current I is situated near a straight conductor XY, such that the conductor is parallel to the side AB of the loop and is in the plane of the loop. If a steady current I is established in the conductor as shown, the conductor XY will

Assertion (A) : Magnetic field lines never intersect each other. Reason (R) : If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.