If a cylinder of diameter 1.0 cm at 30^∘C is to be slid into a hole of diameter 0.9997 cm in a steel plate at the same temperature, the minimum required rise in the temperature of the plate is: (Coefficient of linear expansion of steel = .12 × 10^-6 /^∘C)
a. 25^∘C
b. 35^∘C
c. 45^∘C
d. 55^∘C
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