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Which is grater mu(s) or mu(k)...

Which is grater `mu_(s)` or `mu_(k)`

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It is the force of reaction on the body due to the surface on which it is placed . It always acts perpendicular to the point of contact.
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Using the relation vec(B) = mu_(0) (vec(H)+ vec(M)) , show that X_(m) = mu_(r) - 1 .

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