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Class 11

Class 11. Announcements. Concepts. Induction: changing the magnetic flux in a coil results in a voltage Magnitude of the induced voltage => Faraday’s Law Direction of induced voltage => Lenz’s law Motional EMF: voltage induced on a conductor moving in a magnetic field Generator.

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Class 11

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

  2. Announcements PHY 232 Spring 2003 Prof. S. Billinge

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

  4. 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

  5. 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: • Rotating the loop about an axis perpendicular to the plane of the loop • Rotating about an axis in the plane of the loop • Moving the coil along the field direction • Moving the coil perpendicular to the field direction PHY 232 Spring 2003 Prof. S. Billinge

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

  7. 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: • Rotating the loop about an axis perpendicular to the plane of the loop • Rotating about an axis in the plane of the loop • Moving the coil along the field direction • Moving the coil perpendicular to the field direction • You decide to steal electricity from the electric company inductively. You should: • Tape a coil flat against the mains line (and hire a lawyer) • Tape a coil perpendicular to the mains line (and hire a lawyer) • Wind a coil around the mains line (and hire a lawyer) • Forget it, pay your electric bill instead of the lawyer

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