2 M ln2 (R2-R1)/4piR1Lμ
M ln2 (R2-R1)/piR1Lμ
M ln2 (R2-R1)/4piR1Lμ
M ln2 (R2-R1)/2piR1Lμ

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Using poise equation F=μA(dv/dx) Writting Torque on the inner cylinder = μ 2 pi L w R1^3/(R2-R1)=(MR1^2)/2*dw/dt Integrating thecabove from w to w/2 will fetch u the answer