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A coil of 200turns and another coil of 4...

A coil of 200turns and another coil of 400turns have same length of radius 20cm. Find ratio of magnetic field at their centre if current in both coils is same...

A

0.043055555555556

B

0.084027777777778

C

0.044444444444444

D

0.16736111111111

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