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Ampere’s Law Concept Questions:

Ampere’s Law Concept Questions:. A coaxial cable is shown at right. This type of cable has a central cable that carries the forward current and an outer conducting sheath that carries the return current. Outer conductor carrying return current I. Inner conductor carrying forward current I. X.

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Ampere’s Law Concept Questions:

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  1. Ampere’s Law Concept Questions: A coaxial cable is shown at right. This type of cable has a central cable that carries the forward current and an outer conducting sheath that carries the return current. Outer conductor carrying return current I Inner conductor carrying forward current I X Question: What is the magnetic field outside the wire? A) C) B) D) 0

  2. Electromagnetic Induction Demonstration 1: The north pole of a magnet is plunged into a solenoid coil. Observation of effect on ammeter needle: Demonstration 2: The North pole of the magnet is held at rest in the coil. Demonstration 3: The North pole of the magnet is pulled OUT of the coil. Demonstration 4: The South pole of the magnet is plunged into the coil. Demonstration 5: The South pole of the magnet is moved slowly into the coil and then moved rapidly into the coil. Summary of observations?

  3. Michael Faraday- 1831 Faraday’s Law of Electromagnetic Induction A changing magnetic field in the presence of a conductor will induce charge to flow in a conductor. ● basis of electric generating turbines wind water steam Generates current in conducting coils Rotates magnets ● Complement to Oersted’s Law of Electromagnetism Oersted Current (moving charge) Magnetic Field Faraday

  4. Lenz’s Law-1835 The induced electric current produces its own magnetic field which OPPOSES the changing magnetic field. ● based on Conservation of Energy ● electric potential energy INCREASES as charge separated ● balanced by a DECREASE in kinetic energy of the changing magnetic field ● loss of kinetic energy felt as an OPPOSITION to the changing field

  5. Demonstrations of Lenz’s Law Ex. 2: Pull a N pole of a bar magnet out of a coil What is the direction of the induced current? Ex. 1: Plunge a N pole of a bar magnet into a coil What is the direction of the induced current? Induced N pole Induced S pole N S

  6. Ex. 3: Compare the rate of fall of a steel plug and a magnet in a copper pipe. Observations? The magnet falls much SLOWER than the metal plug. Reason: The changing magnetic field induces a current loop called an EDDY CURRENT in the pipe that opposes the changing field!

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