PHY 232 Spring 2003 Prof. S. Billinge Class 11. PHY 232 Spring 2003 Prof. S. Billinge Announcements.

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Presentation transcript:

PHY 232 Spring 2003 Prof. S. Billinge Class 11

PHY 232 Spring 2003 Prof. S. Billinge Announcements

PHY 232 Spring 2003 Prof. S. Billinge Concepts 1.Induction: changing the magnetic flux in a coil results in a voltage 1.Magnitude of the induced voltage => Faraday’s Law 2.Direction of induced voltage => Lenz’s law 2.Motional EMF: voltage induced on a conductor moving in a magnetic field 3.Generator

PHY 232 Spring 2003 Prof. S. Billinge Problem solving Find the MAGNITUDE of the induced EMF using an equation Find the direction of the induced EMF using Lenz’s law

PHY 232 Spring 2003 Prof. S. Billinge A circular loop of wire is located in a uniform and constant B-field. Which of the following are true…An EMF can be induced by: 1.Rotating the loop about an axis perpendicular to the plane of the loop 2.Rotating about an axis in the plane of the loop 3.Moving the coil along the field direction 4.Moving the coil perpendicular to the field direction

PHY 232 Spring 2003 Prof. S. Billinge You decide to steal electricity from the electric company inductively. You should: 1.Tape a coil flat against the mains line (and hire a lawyer) 2.Tape a coil perpendicular to the mains line (and hire a lawyer) 3.Wind a coil around the mains line (and hire a lawyer) 4.Forget it, pay your electric bill instead of the lawyer

A circular loop of wire is located in a uniform and constant B-field. Which of the following are true…An EMF can be induced by: 1.Rotating the loop about an axis perpendicular to the plane of the loop 2.Rotating about an axis in the plane of the loop 3.Moving the coil along the field direction 4.Moving the coil perpendicular to the field direction You decide to steal electricity from the electric company inductively. You should: 1.Tape a coil flat against the mains line (and hire a lawyer) 2.Tape a coil perpendicular to the mains line (and hire a lawyer) 3.Wind a coil around the mains line (and hire a lawyer) 4.Forget it, pay your electric bill instead of the lawyer