Information Sheet

# Information Sheet - Magnetism due to movement of electric...

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Magnetism- due to movement of electric charges Field Lines point from North to South. North pole of a magnet is attracted to south pole of second magnet. Meissner effect- superconductors expel any magnetic field from its interior. Electromagnetics- Principles: an electric current or a changing electric field induces a magnetic field A changing magnetic field induces an electric field. Observation1: a moving electric charge produces a magnetic field in the space around it. And electric current produces a magnetic field around it. Strength proportional to size of current and inverse to distance from wire. Reverse direction of current=reverse direction of magnetic field. Straight wire – magnetic field is circular Coil with current (electromagnet) = magnetic field around a bar magnet (Solenoid= length > diameter) Produce strongest magnetic fields (more coils / more current = more strength) South end = side connected to POSITIVE part of battery Stationary electric charge is not affected by a magnetic field Observation 2: a magnetic field exerts a force on a moving electric charge. Magnetic field exerts a force on a current carrying wire. Slower particles are bent more. Heavier particles are bent less TRICK: thumb sticking up, (the ' thumbs up hand sign').Keeping thumb in position, point your index finger out, (like your hand is a pistol ).Keeping the ' cocked pistol ' finger position, stick your middle finger out perpendicular to both your thumb and index finger. Your thumb indicates the direction of motion of the charged particle .Your index finger indicates the direction of the magnetic field . Your middle finger indicates the direction of the

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## This note was uploaded on 04/07/2008 for the course ECON 201 taught by Professor Williams during the Fall '08 term at UVA.

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Information Sheet - Magnetism due to movement of electric...

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