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

Question:

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 × 10-3 N. Determine the magnitude of the external magnetic field.