The magnitude of a magnetic field is [[1]] proportional to the strength of the electric current flowing in the wire.

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Detailed Solution

The magnitude of a magnetic field is directly proportional to the strength of the electric current flowing in the wire.
The magnitude of the magnetic field due to the current flowing in a straight conductor is directly proportional to the current. The more flux lines there are for the conductor to cut. The strength of flux is directly proportional to the induced voltage. In other words, the magnetic flux density through a coil is directly proportional to the current. So, when the current increases, the magnetic flux density increases.

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