A soft surface cone clutch handles 200 Nm of torque at 1250 rev / min. The large diameter of the clutch is 350 mm. The cone pitch angle is 6- the face width is 65 mm 1 4 and the coefficient of friction is 0.20. Assuming uniform wear, the axial force required to transmit the torque is (a) 237 N (b) 437 N (c) 537 N (d) 637 N