Please attach a picture showing the direction of the RESULTANT magnetic field at

Question

Please attach a picture showing the direction of the RESULTANT magnetic field at point P to receive best rating.

Two wires lie perpendicular to the plane of the paper, and equal electric currents pass through the paper in the directions shown. Point P is equidistant from the two wires. Construct a vector diagram showing the direction of the resultant magnetic field at point P due to currents in these two wires. Explain your reasoning. If the currents in both wires were instead directed into the plane of the page (such that the current moved away from us), show the resultant magnetic field at point P.

Explanation / Answer

A dot means out of the page and a cross means into the page.

This question's all about the right hand rule. Take your right hand as a fist with your thumb sticking straight out. Point your thumb in the direction of the current and your fingers curl in the direction of the magnetic field the current creates. In

Vector diagram:

by right hand rule:

a)

-----> p <-----

(b)

<------ p <-------

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