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(a) What is the magnetic field at a point 50 mm from a long straight wire carrying a current of 3 A? (b) A small current element I dl with dl = 2k and I = 2 A is centred at the origin. Find the magnetic field d B at the following points: (i) on the x-axis at x = 3 m, (ii) on the x-axis at x = ^6 m, (iii) on the z-axis at z = 3 m, (iv) on the y-axis at y = 3 m. |
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