posted by josh .
A long, vertical, straight wire carries a current I going upwards. The wire is perpendicular to the plane of a circular metal loop and passes through the center of the loop. The loop is allowed to fall and maintains its orientation with respect to the straight wire while doing so. Is there an induced current in the loop? If so, in what direction does the current induced in the loop flow?
A particle of charge +q and mass m is initially launched at speed v in a region with a constant, uniform magnetic field of magnitude B. If the particle launched in a direction perpendicular to the magnetic field, by the time the particle has traveled a distance d, the work done by the magnetic force on the particle is equal to: