A circular wire coil of radius 3.0 cm and 40 turns is positioned in a vertical n

Question

A circular wire coil of radius 3.0 cm and 40 turns is positioned in a vertical north-south plane (perpendicular to the page in this view). Three compasses are then placed along the axis of the coil: one at the center of the coil, one 4.0 cm west (left) of center, and one 4.0 cm cast (right) of center. When there is no current in the coil, all three compass needles point due north, aligning with the Earth's magnetic field of strength 5.0 times 10^-5. But when current passes through the coil, the needles swing away from north and point in new directions. What direction will each compass end up pointing if 0.090 lambda of current flows through the coil in the indicated direction?

Explanation / Answer

From the left hand rule, when the current direction shown by the thum, the curling fingers shows the direction of magnetic field. so,

The middle one shows towards north

left on shows north west

right on shows north east.

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