There is a counterclockwise current I in a circular loop ofwire situated in an e

Question

There is a counterclockwise current I in a circular loop ofwire situated in an external magnetic field directed out of thepaper. The effect of the forces that act on this current isto make the loop a. expand in size b. contract in size c rotateabout an axis perpendicular to the page d. rotate about anaxis in the plane of the page e. accelerate into thepage Explain your answer There is a counterclockwise current I in a circular loop ofwire situated in an external magnetic field directed out of thepaper. The effect of the forces that act on this current isto make the loop a. expand in size b. contract in size c rotateabout an axis perpendicular to the page d. rotate about anaxis in the plane of the page e. accelerate into thepage Explain your answer

Explanation / Answer

      d.       rotateabout an axis in the plane of the page    When a current carruing loop is placed in amagnetic field, a torque works on it so as to orient the loop inposition on minimum torque ( and hence minimum energy). Thereforethe torque tends to rotate the loop about an axis that lies inplane of loop.    When a current carruing loop is placed in amagnetic field, a torque works on it so as to orient the loop inposition on minimum torque ( and hence minimum energy). Thereforethe torque tends to rotate the loop about an axis that lies inplane of loop.

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