Question

A horizontal current-carrying wire that is perpendicular to the plane of the paper is placed in...

A horizontal current-carrying wire that is perpendicular to the plane of the paper is placed in a uniform magnetic field of magnitude 2.8 mTmT that is parallel to the plane of the paper and points down. At the distance 1.0 cmcm to the right of the wire, the total magnetic field is zero.

A.

What is the direction of the current in the wire if the zero point is 0.4  to the left of the wire?

Into the page.
Out of the page.
Direction cannot be uniquely determined.

B.

What is the magnitude of the current in the wire if the zero field point is 0.4 cmcm to the left of the wire?

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