Find the distance at which the magnetic field on axis as compared to the magnetic field at the centre of the coil carrying current I and radius R is 1/27. (A) R (B) 2√2 R (C) √2R (D) √3 R
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If a coil of radius R is carrying current L, then magnetic field
on its axis at a distance x from its centre is given by
At centre
Dividing Eq. (i) by Eq. (ii), we get
or
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