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Answer the following: a) A circular lo...

Answer the following:
a) A circular loop of Radius `R` carries a current `I`. Obtain an expression for the magnetic field at a point on its axis at a distance of `x` from its centre.
b) A conducting rod of length `2 m` is placed on a horizontal table in north-south direction. It carries a current of `5 A` from south to north. Find the direction and magnitude of magnetic force acting on the rod. Given that Earth's magnetic field at the place is `0.6 xx 10^(-4) T` and angle of dip is `(pi/6)`

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