20.5 Applications of magnetic forces paper cone coil magnet Moving-coil loudspeakers Moving-coil loudspeakers A moving-coil loudspeaker contains a coil – free to move in the magnetic field of a permanent magnet Varying current passes through the coil. The coil experiences varying magnetic force. varying I
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20.5 Applications of magnetic forces paper cone coil magnet Moving-coil loudspeakers A moving-coil loudspeaker contains a coil – free to move in the.
20.5 Applications of magnetic forces side CD When a current passes through the coil... current A B C D magnetic field downward force upward force side AB side BC no force The coil rotates. Turning effect on a current-carrying coil in a magnetic field
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20.5 Applications of magnetic forces
paper cone
coil
magnet
Moving-coil loudspeakers Moving-coil loudspeakers A moving-coil loudspeaker contains a coil
– free to move in the magnetic field of a permanent magnet
Varying current passes through the coil.
The coil experiences varying magnetic force.
varying I
20.5 Applications of magnetic forces
The coil moves inwards and outwards.
Sound is produced.
The paper cone attached vibrates.
20.5 Applications of magnetic forces
side CD
When a current passes through the coil...
currentA
BC
D
magnetic fielddownward force
upward force
side AB
side BCno force
The coil rotates.
Turning effect on a current-Turning effect on a current-carrying coil in a magnetic field carrying coil in a magnetic field
20.5 Applications of magnetic forces
The turning effect on the coil can be increased by:increasing the currentincreasing the strength of magnetic field winding more turns of wireincreasing the area of the coil