Magnetic Field Produced by Straight Currents Video Lessons

Concept

# Problem: Shown at the right is a cross-sectional view of two long straight wires that are parallel to one another. One wire carries current io out of the page, the other carries an equal current into the page.Draw a vector on the diagram to show the direction of the magnetic field, if any, at point P. Explain your reasoning.

###### FREE Expert Solution

Right-hand rule: The thumb points in the direction of the current. Fingers curl in the direction of the magnetic field.

The field when the current is into the page is counterclockwise.

The field when the current is out of the page is clockwise.

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###### Problem Details

Shown at the right is a cross-sectional view of two long straight wires that are parallel to one another. One wire carries current io out of the page, the other carries an equal current into the page.

Draw a vector on the diagram to show the direction of the magnetic field, if any, at point P. Explain your reasoning.