The Two Arms of a U-Tube Are Not Identical, One

Multiple Choice

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

A) 4 N
B) 8 N
C) 16 N
D) 32 N
E) 64 N