A U-shaped wire of mass has its ends immersed in two jars of mercury, which are separated by a distance . The wire is in uniform magnetic field perpendicular to the plane of the wire. A very fast current pulse is passed through the wire and in response the wire jumps upward a height . How large was the charge which passed through the wire? Use . (You may want to use the results of (Part a).) You may ignore the effect of the gravitational field while the current pulse runs through the wi

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b. b. at twice the distance, the magnitude of the field is 2b. c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.