QUESTION 1 The figure to the right shows a uniform magnetic field pointing to th

Question

QUESTION 1 The figure to the right shows a uniform magnetic field pointing to the left of the page. An infinite straight wire passes through the point drawn. In what direction must current flow in the wire to produce zero magnetic field at the point P? Wire Select One of the Following: (a) into the page (b) out of the page (c) to the left of the page (d) to the right of the page e) to the top of the page (f) to the bottom of the page (8) No direction of current in the wire will produce zero total field at P

Explanation / Answer

The magnetic field at point P is towards left due to the existing magnetic field B, so to have a net magnetic field of zero at point P we need another magnetic field towards right at point P due to the current in wire. For this to happen we know form RIGHT HAND RULE that a current into the page in the wire would produce a magnetic field towards right at point P. So the answer is a) into the page.

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