A current-carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should passed in the conductor:(a) from top towards bottom        (b) from left towards right
(c) from bottom towards top        (d) from right towards left

(a) from top towards bottom

It is given that the current-carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor from the top towards the bottom. It is concluded by applying the right-hand thumb rule.

Extra information with the image is posted for reference only
Maxwell’s right-hand thumb rule indicates the direction of the magnetic field if the direction of current is known.
According to this rule, if we hold the current-carrying wire in our right hand so that our thumb points in the direction of the current, the direction in which our fingers wrap the wire will give the direction of magnetic field lines around the wire.
When thumb points upwards, the wrapped fingers are anticlockwise. So, the direction of the magnetic field is anticlockwise.
When thumb points downwards, the wrapped fingers are clockwise. So, the direction of the magnetic field is clockwise.


Updated on: 10-Oct-2022

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