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Current I is flowing in a coil and two points B1 and B2 are on the axis of coil at a distance 0.05 m and 0.2 meter respectively. If ratio of magnetic field at point B1 and B2 are in 8 : 1, then find radius of coil.

(1) 0.1 m 

(2) 0.2 m 

(3) 0.7 m 

(4) 0.8 m

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Magnetic effects of current and magnetism, Magnetic dipole moment

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Ans : (1) 0.1 m 

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