PH 122 Lecture Notes - Electric Potential, Root Mean Square
Document Summary
Changing magnetic fields can induce electric potential differences. Changing flux and the resulting induced potential difference is responsible for devices ranging from transformers to magnetic brakes. This connection of magnetism and electricity is responsible for some truly remarkable effects. A shark is sensitive to a potential difference of 5 nv. If the shark"s head is 0. 6 m wide, and it swims at 2. 0 m/s in a location where the dip angle is 60 . V = (2. 0 m/s) (0. 6 m) (50 x 10-5 tsin60 ) 5 x 10-5 v = (2. 0 m/s) (0. 6 m) b. Is the angle between the magnetic field b and the axis of the loop. The magnetic flux through the loop is = abcos . There is an induced current in a closed, conducting loop if and only if the magnetic flux through the loop is changing. The direction of the induced current is such that the induced magnetic field opposes the change in the flux.
