A straight wire is held vertically. If the current passes through this wire in the downward direction, what is the direction of the magnetic field produced by it?

upward

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downward

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clockwise

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anticlockwise

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Solution

The correct option is C clockwise
Answer is C.
The direction of the magnetic field can be determined by the thumb rule.
When an electric current passes through a straight wire, the thumb points in the direction of the conventional current (from positive to negative), and the fingers point in the direction of the magnetic lines of flux.
In this case, a straight wire is held vertically and the current passes through this wire in the downward direction. Therefore, the magnetic lines of force in the clockwise direction.

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