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PHYSICS 112 - REVIEW FOR EXAM 3 MAGNETIC FLUX: The magnetic flux through a plane circuit is cos , where is the angle between F ) ) œ FE F t and the normal ( perpendicular) to the plane of the circuit. Units: T-m . ´ 2 MAGNETIC INDUCTION The current induced in plane loop is proportional to the rate of change of the magnetic flux through the loop. If the loop has electrical resistance , the current is given by Faraday's law: . V M œ ?F ? Î > V LENZ' LAW The direction of the induced current in a loop is such as to oppose the change in flux that produced it. Thus if the flux is increasing/decreasing in magnitude, the induced current must produce a magnetic field in the opposite/same direction as the external magnetic field. ELECTROMAGNETIC WAVES A plane electromagnetic waves has electric field and magnetic field that are perpendicular to each I F t t other and always in phase (zero at same time, maxima and minima at the same time) and always both perpendicular to the direction of propagation
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