33. A horizontal wire of length 0.53 m, carrying a current of 7.5 A, is placed in a uniform external magnetic field. When the wire is horizontal, it experiences no magnetic force. When the wire is tilted upward at an angle of 19°, it experiences a magnetic force of 4.4 x 10-3 N. Determine the magnitude of the external magnetic field.

 

The magnetic force on a current carrying wire in a magnetic field can be written as

 

 

The magnitude of this force can be written as

 

Solve for B

 

 

 

 

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This page last updated on June 21, 2018