Do you know which of the following is a source of EMF? a) a charge that is perpetual (B) no responses D) a permanent magnet with no moving parts. Charges are constantly flowing through the system.

A ten-turn solenoid has a ferromagnetic core with a relative permeability of 10,000. The length of the solenoid is l=10 cm and its cross section area is A=1 cm2.  The amount of current driving the solenoid is 0.1 A.  Determine the magnetic energy density in the core.  Provide an answer in milli Joules per cubic meter. Round off to one decimal.

QUESTION 1 While it is common for electricity to be caused by the flow of electrons, we know that electric current can also flow whenever a. a constant magnetic field is present b. conductors are isolated. C. electrons, protons, or other charged particles move. d. dipoles are aligned.

In this Exercise 6 we will explore laws critical to the study of electromagnetism. We will be using Simulation 3 (below) to explore how a moving magnet produces current in a nearby coil of wire.   a. Magnetic field strength decreases as you get farther from the poles of the magnet. Does the flux through the face of the coil change as you move the magnet? Explain your answer. b. Why does the meter needle deflect? Is the deflection in accordance with Lenz’s Law? Justify your answer in terms of Lenz’s law and your above answers.