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(C) The magnetic field $B$ at the center of a circular loop carrying current $I$ with radius $r$ and $N$ turns is given by the formula: $B = \frac{\mu

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$6$

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(C) The magnetic field $B$ at the center of a circular loop carrying current $I$ with radius $r$ and $N$ turns is given by the formula: $B = \frac{\mu_0 N I}{2r}$.From this formula,it is clear that the magnetic field $B$ is directly proportional to the number of turns $N$ $(B \propto N)$.If the number of turns increases from $1$ to $6$,the magnetic field will also increase by a factor of $6$.Therefore,the magnetic field becomes $6$ times stronger.

If a circular loop is made of $6$ closely wound turns instead of a single turn,the magnetic field produced at the center of the loop becomes $.........$ times stronger.

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