help would be greatly appreciated The moment of a bar magnet may be characterize

Question

help would be greatly appreciated

The moment of a bar magnet may be characterized by a vector m. (The direction of m is along the axis of the magnet from the negative (south) to the positive (north) pole; the magnitude depends on the size of the magnet and the material from which it is made.) It can be shown that the magnetic field H (a vector) experienced at a point whose position vector relative to the centre of the magnet is r, is given by H = -m/|r|3 + 3(m r)r/|r|5 Find H at (1, 0, 0) if the magnetic moment has a strength 5 in the direction of the vector and if the magnet is placed with its centre at the point (-1, 2, 3). (A small magnet would tend to orientate in the direction of H.)

Explanation / Answer

here, m= 5(i+j)/root(2)

r=x-xo=i-(-i+2j+3k)

=2i-2j-3k

hence, mod(r)=root(17)

hence u can find H

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