A coil having 12 turns is connected to a battery. The magnetic field at the axis of the helix will be ___ compared to the magnetic field at the center of a circular loop of the same radius carrying current.

Greater

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Equal

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Lesser

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Can’t say

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Solution

The correct option is A
Greater

The magnetic field at the center of a loop is a straight line due to the sum of components of magnetic fields at the center due to different parts of the loop.

When we take a coil having 12 turns, the magnetic field at the axis is the sum of magnetic fields from each loop of the coil. Hence, it is 12 times the magnetic field due to a single loop, since the radii are the same.

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