Q. When a load of 10 kg is suspended on a metallic wire its length increases by 2 mm the force constant of the wire is
(1) 3×10⁴ N/m
(2) 2.5×10³ N/m
(3) 5×10⁴ N/m
(4) 7.5×10³ N/m

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Solution

F = kx
=> k = F/x = (10kg x 10m/s^2)/(0.002m) = 5 x 10^4 N/m
Therfore Ans = (3)

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