Question

how can magnitude of magnetic field can be used​

Answer 1

The magnitude of the magnetic field depends on the amount of current, and the distance from the charge-carrying wire. ... The direction of the magnetic field can be determined using the "right hand rule", by pointing the thumb of your right hand in the direction of the current.

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Answer 2

Answer

The magnitude of the magnetic field depends on the amount of current, and the distance from the charge-carrying wire. ... The direction of the magnetic field can be determined using the "right hand rule", by pointing the thumb of your right hand in the direction of the current.