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  4. A wire carrying a current of 4√5 amperes is bent into the form of a circle of radius 5 cm. The flux density at a distance of 10 cm on the axis passing through the centre of the coil and perpendicular to its plane is

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Q. A wire carrying a current of $4\sqrt5$ amperes is bent into the form of a circle of radius 5 cm. The flux density at a distance of 10 cm on the axis passing through the centre of the coil and perpendicular to its plane is

Moving Charges and Magnetism

Solution:

$B=\frac{\mu_0\,nir^2}{2(r^2+x^2)^{3/2}}$