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Magnetic Field

A wire is ben...

Question

A wire is bent into a circular loop of radius R and carries a current I. The magnetic field at the center of the loop is B. The same wire is now bent into a double loop. If both loops carry the same current I in the same direction, the magnetic field at the center of the double loop will be

A

Zero

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B

2B

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C

4B

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D

8B

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Solution

The correct option is C 4B
$B \propto n^{2}$

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