The magnetic field in a loudspeaker is 0.2 T. The wire consists of 266 turns wou

Question

The magnetic field in a loudspeaker is 0.2 T.
The wire consists of 266 turns wound on a
2.62 cm diameter cylindrical form. The resis-
tance of the wire is 7.7
.
Find the force exerted on the wire when
11.1 V is placed across the wire.
Answer in units of N

Explanation / Answer

Current in coil A = V/R >A = 11.1/7.7 =1.44 A Length of wire = 266 x (2pr) dia. of coil =0.0262 m .... r = 0.0131 m >L = 266 x (2p x 0.0131m) > L = 21.89 m As speaker magnet has a radial field pattern all the wire length L runs perpendicular to the field Using F = B x A x L for force on wire F = 0.2T x 1.44A x 21.89m ..?F = 6.3 N

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