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A block placed on a rough inclined plane...

A block placed on a rough inclined plane of inclination `( theta= 30^(@))` can just be pushed upwards by applying a froce "F"as shown. If the angle of inclination of the inclined plane is increased to `( theta = 60^(@))` , the same block can just be prevented from sliding down by application of a force of same magnitude. The coefficient of friction between the block and the inclined plane is

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