A straight tooth gear having involute profile with 20° pressure angle transmits 20Nm torque. Pitch diameter of the gear is 24 cm. If only one pair of tooth is engaged at any instant of time, the force experienced by the tooth will be ______
(a) 78.30 N
(b) 88.70 N
(c) 156.60 N
(d) 177.36 N
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