At the end of this lesson you should be able to:

• Determine the magnitude of the magnetic flux through a surface of known area, given the strength of the magnetic field and the angle between the direction of the magnetic field and the surface.
• Write a statement of Faraday's law in terms of changing magnetic flux. Use Faraday's law to determine the magnitude of the induced emf in a closed loop due to a change in the magnetic flux through the loop.
• State Lenz's law and use it to determine the direction of the induced current.
• Explain how an eddy current can be produced in piece of metal. Also describe situations in which eddy currents are benificial and situations when they must be eliminated.
• Explain what is meant by inductance. State the S.I. unit for inductance.
• Write the equation for the energy stored in an inductor's magnetic field and also for the energy stored per unit volume, i.e. the energy density.