U - shaped film of a liquid is formed between a wire frame and movable wire 5 cm long. Then the force required to hold the wire in equilibrium is ,
(Surface tension of liquid is 0.024 N/m )
A. `2.4 xx 10^(-3)` N
B. ` 24 xx 10^(-3)` N
C. ` 2. 4 xx 10^(-3)` dyne
D. ` 2.4 xx 10^(-3)` dyne/cm
