At a certain location in the Philippines, Earth's magnetic field of 39 μT is horizontal and directed due north. Suppose the net field is zero exactly 8.9 cm above a long straight, horizontal wire that carries a constant current. (a) What is the magnitude of the current?    _________________A(b) What is the direction of the current?         1) south         2) north             3) west         4) east (please show units. It really helps me out)

Glencoe Physics: Principles and Problems, Student Edition
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Chapter24: Magnetic Fields
Section: Chapter Questions
Problem 67A
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At a certain location in the Philippines, Earth's magnetic field of 39 μT is horizontal and directed due north. Suppose the net field is zero exactly 8.9 cm above a long straight, horizontal wire that carries a constant current.

(a) What is the magnitude of the current?
    _________________A

(b) What is the direction of the current?
        1) south
        2) north    
        3) west
        4) east

(please show units. It really helps me out)

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