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The magnetic field at the center of current carrying circular loop is B 1 . The magnetic field at a distance of 3 times radius of the given circular loop from the center on its axis is B 2 . The value of B 1 /B 2 will be

1. 9 : 4
2. 12 : 5
3. 8 : 1
4. 5 : 3

Correct answer: 8 : 1

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