List of top Physics Questions on Moving charges and magnetism asked in BHU UET

A wire carrying current $i$ and other carrying $2i$ in the same direction produce a magnetic field $B $ at the midpoint. What will be the field when $2i$ current is switched off?

A charged particle enters in a magnetic field $H$ with its initial velocity making an angle of $45^{\circ}$ with $H$. The path of the particle will be

Two streams of protons move parallel to each other in the same direction. Then these

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

The magnetic needle lying parallel to the magnetic field requires $W$ units of work to rotate it through $60^{\circ}$. The torque needed to maintain the needle in this position is :