A spring of mean radius 40 mm contains 8 action coils of steel ( N = 80000 N/mm 2 ), 4 mm in diameter. The clearance between the coils being 1 mm when unloaded, the minimum compressive load to remove the clearance, is

A spring of mean radius 40 mm contains 8 action coils of steel ( N = 8

1.	A spring of mean radius 40 mm contains 8 action coils of steel ( N = 80000 N/mm 2 ), 4 mm in diameter. The clearance between the coils being 1 mm when unloaded, the minimum compressive load to remove the clearance, is
A.	25 N
B.	30 N
C.	35 N
D.	40 N
Answer» D. 40 N

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A spring of mean radius 40 mm contains 8 action coils of steel ( N = 80000 N/mm 2 ), 4 mm in diameter. The clearance between the coils being 1 mm when unloaded, the minimum compressive load to remove the clearance, is

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