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The magnetic field at the centre of a ti...

The magnetic field at the centre of a tightly wound spiral coil with inner radius R and outer radius 4.5 R with number of turns 22, when current i is flowing through it, is

A

`(11mu_0i)/(7R)ln(4.5)`

B

`(22mu_0i)/(7R)ln(4.5)`

C

`(11mu_0i)/(7R)`

D

Zero

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