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2014-11-09T17:07:07+05:30

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The magnetic force is horizontal and is 16 N. This gives the normal reaction force on magnet exerted by the board. 

Frictional force between board and magnet = μ N = μ 16 Newtons

Weight of magnet = 2 * 10 Newtons.

They are in equilibrium and hence the magnet is stationary.
 
 Hence   16 μ = 20    =>  μ = 1.25        ( it is very high because of magnetic effect)


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