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Magnetic Field Due to a Circular Ring on the Axis

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Question

There is a horizontal straight wire carrying current from West to East. Magnetic field due to this wire at a point:

A

above it is towards South

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B

below it is downwards North

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C

below it is vertically downwards

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D

below it is towards West

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Solution

The correct option is A above it is towards South
The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of right hand would curl if they are wrapped around the wire with thumb in the direction of the current.
When thumb points towards east, the fingers curl around it to point towards north below it ,and south above it.

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