Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?
A)
the first at the midpoint
B)
the second at the doorknob
C)
both exert equal non-zero torques
D)
both exert zero torques
E)
additional information is needed
B
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A. 
B. 
C. 
D. 