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(a). Find the magnetic field B at point ...

(a). Find the magnetic field B at point O (centre) of
(i). ABCD, which is a square of side l.
(ii). ABC, which is an equilateral triangle of side l.


(b) Twelve uniform wires of equal length l and each of resistance r are connected to form a skelton cube. A battary of emf E is connected between two diagonally opposite corners of the cube. The magnetic induction at the centreof the cube is .........
(c) An infinately long straight wire is placed at the origin along the z-axis. The current I flows along the positive z-axis. Find the unit vecotrs showing the direction of magnetic field at the four points: `P(a,0), Q(0,b), R(a,0) and S(0,-b)`

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