A horizontal wire of length 0.53m, carrying a current of 7.5A,is placed in a uni

Question

A horizontal wire of length 0.53m, carrying a current of 7.5A,is placed in a uniform external magnetic field. When the wire ishorizontal, it experiences no magnetic force. When the wire istilted upward at an angle of 19 degrees, it experiences a magneticforce of 4.4E-3N. Determine the magnitude of the external magneticfield. Not sure where to begin. A horizontal wire of length 0.53m, carrying a current of 7.5A,is placed in a uniform external magnetic field. When the wire ishorizontal, it experiences no magnetic force. When the wire istilted upward at an angle of 19 degrees, it experiences a magneticforce of 4.4E-3N. Determine the magnitude of the external magneticfield. Not sure where to begin.

Explanation / Answer

   Force on a current carryingwire   F   =   B* I * L * sin    4.4 *10-3   =   B * 7.5 * 0.53* sin 190    Magnitude of magenticfield   B   =   4.4 *10-3 / 1.294                                                       =   3.40* 10-3   T    Magnitude of magenticfield   B   =   4.4 *10-3 / 1.294                                                       =   3.40* 10-3   T

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