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A horizontal wire of length 0.26 m, carrying a current of 7.2 A, is placed in a uniform external magnetic field. When the wire is

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A horizontal wire of length 0.26 m, carrying a current of 7.2 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 20", it experiences a magnetic force of 6.9 x 10-3 N. Determine the magnitude of the external magnetic field

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