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If the current through the circular coil is doubled keeping the radius same, then the magnetic field intensity at the centre of the circular coil will be

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doubled

becomes half

will increase four times

none of the above

answer is A.

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Detailed Solution

If the current through the circular coil is doubled, keeping the radius the same will double the magnetic field intensity at the centre of the circular coil.
We know that a magnetic field

B

at a point positioned at a distance r from a current-carrying conductor is given by,

α \frac{I}{r}

. Here the magnetic field is directly proportional to the current

(I)

.
Therefore when the current here is doubled, keeping radius the same, the magnetic field intensity is also doubled.

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