Electromagnetic Induction. Induced current/emf(voltage) Current or voltage produced by a changing magnetic field.

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Presentation transcript:

Electromagnetic Induction

Induced current/emf(voltage) Current or voltage produced by a changing magnetic field.

Motional Emf (voltage)  = v B L Is energy Conserved?

Magnetic Flux Magnetic flux is the “amount” of field lines that pass through a surface Φ = B A cos(φ) (Wb)

Flux

What is the flux through a 2m 2 surface that is 1) perpendicular 2) oriented 30 o 3) parallel to a magnetic field of strength 0.5 T? 30

Faraday’s Law  = -N (Δ Φ / Δ t) What is the induced emf in a 20 turn loop of wire with an area of 1.5x10 -3 m 2 if it is placed perpendicular to a magnetic field that changes from 0.06T to 0.05T in 0.1sec?

Faraday’s Law  = -N (Δ Φ / Δ t) What is the induced emf in a 50 turn loop of wire with an area of 0.02 m 2 if it is placed perpendicular to a magnetic field of 0.18T and then rotated 30 o in 0.1sec?

Generator  sin(  t) A generator made up 40 turns of wire, each with an area of 0.02m 2 is rotating with an angular velocity of 30 rad/sec inside a magnetic field of strength 0.4T. What is the maximum induced voltage of this generator?