A circle current loop 20 cm radius carries a [I] A current….

A circle current loop 20 cm radius carries a [I] A current. The loop is in a [B] T uniform magnetic field. The axis of the loop, perpendicular to the plane of the loop, is 60 degrees away from the field direction. What is the magnitude of the torque on the current loop?

A proton travels between the two parallel charged plates sho…

A proton travels between the two parallel charged plates shown in the figure. The plates are separated by 1.0 cm and are charged by a [V] V battery. There is a magnetic field strength [B] T which allows the proton to pass between the plates without being deflected. What is the speed of this proton in m/s? Ignore gravitational force.