The two arms of a U-tube are not identical, one having 2

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The two arms of a U-tube are not identical, one having 2.5 times the diameter of the other. A cork in the narrow arm requires a force of 16 N to remove it. The tube is filled with water and the wide arm is fitted with a piston. The minimum force that must be applied to the piston to push the cork out is:  

64 N

90 N

100 N

160 N

4 N