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Download Interactions between Electricity and Magnetism
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Transcript
Interactions between Electricity and Magnetism Interactions between electricity and magnetism all involve some motion of either charges (electricity) or changes in the magnetic field. Mag/Elec Interactions Magnetic Force There is a magnetic force whenever a charge (or charged object) moves across a magnetic field. The Force direction obeys the Right hand rule we discussed in class. The equation for this is F = q v B q = amount of charge (C), v = velocity, B = magnetic field (Teslas) Magnetic Force on moving charge Mag/Elec Interactions Right Hand Rule # 1 Point fingers in direction of moving charge q Orient your palm so it’s facing the direction of the magnetic field B Extend your thumb, it’s the direction of the force. This force happens only when the charge moves perpendicular to the magnetic field B. Right hand rule for magnetic force Mag/Elec Interactions A wire carrying a current creates it’s own magnetic field. This field is circular and its orientation is determined by Right hand rule #2 Mag/Elec Interactions Right Hand Rule # 2: to determine the direction of the circular magnetic field around a wire carrying a current. Direct your thumb along the wire in the direction of the current. Your fingers curl in the direction of the circular magnetic field Mag/Elec Interactions Electro-magnets If you coil a wire into a helical form (like wrapping a wire around a cylinder) and run a current through it, each circular coil creates a small mag field. The mag field from each coil “adds up” to create what looks like a magnet with a North and South pole. By running a current through this wire, you “make” a magnet. This is also known as a solenoid.
