A bead of mass m is located on a parabolic wire (equation x 2 = ay) with its axis vertical and vertex directed downward as in figure. If the coefficient of friction is µ, the highest distance above the x-axis at which the particle will be in equilibrium is
A
µa
B
µ 2 a
C
µ 2 a
D
µa
Text Solution
Verified by ExpertsThe correct answer is:
C
For the sliding not to occur when
tan θ ≤ μ
tan θ = 
= 
= 
= 2 
∴ 2 
≤ μ or y ≤ 
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