Magnetism: Electromagnetism
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9 Terms
Magnetic field around a wire
Produced when an electric current flows through the wire
Two ways to increase field strength around a wire
Increase the current or move closer to the wire
Right-hand grip rule
Thumb follows current direction, fingers curl in magnetic field direction
Solenoid
A cylindrical coil of wire
Magnetic field of a solenoid
Similar in shape to a bar magnet
Increasing solenoid strength
Put an iron core inside the coil
Advantages of electromagnets
Can be switched on/off and strength can be controlled
Electric bell: Hammer hit
Armature is attracted to magnet and pulls away from contact point
Electric bell: Reset
Circuit breaks, magnet turns off, spring pulls armature back to contact
