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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. Magnetic Force Magnetic Force There is a magnetic force whenever a charge (or charged object) moves across a magnetic field. The equation for this is F = q v B q = amount of charge (C) v = velocity B = magnetic field (Teslas) Right Hand Rule #1 Extend your thumb, it’s the direction of the current. Point fingers in direction of the Magnetic Field, B. (Fingers = field lines) Orient your palm so it’s the direction of the force (Palm Push) This force happens only when the charge moves perpendicular to the magnetic field B. 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.
