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A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

A. 3.6 N/mm² compression

B. 3.6 N/mm² tension

C. 7.2 N/mm² compression

D. 7.2 N/mm² tension

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