Which wire, when current flows through it, would be surrounded by the strongest magnetic field?

The strongest magnetic field is in (c) .

Explanation:

We know that moving current creates the magnetic field around a wire. The magnetic field of a wire depends on the number of turns. Mathematically, it can be related as :

where,

n is the number of turns

When the no of turns around a wire increases, the associated electric field increase. Hence, the magnetic field will be strongest.

Hence, the correct option is (c).

The correct answer is:

C. The long coil (attached)

The wire, when current flows through it, is surrounded by the strongest magnetic field.

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