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When a hole of diameter 'd' is punched in a metal of thickness 't', then the force required to punch a hole is equal to (where`tau_u` = Ultimate shear strength of the material of the plat


Options:
A .  `d.t.tau_u`
B .  `pi d.t.tau_u`
C .  `pi/4 xx d^2 tau_u`
D .  `pi/4 xx d^2 xx t tau_u`
Answer: Option B


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