Question

42. The surface tension of a liquid is
0.04Nm-1. Its value in C.G.S. system is
1) 4 dyne cm 2) 40 dyne cm
3) 400 dyne cm 4) 0.004 dyne cm-1

Answer 1

1dyne=10−5 N

1dyne=10−5 N1cm=10−2 m 

1dyne=10−5 N1cm=10−2 m ∴cmdyne=10−2m10−5N=m10−3N

1dyne=10−5 N1cm=10−2 m ∴cmdyne=10−2m10−5N=m10−3N∴cm45dyne=m45×10−3N=0.045N/m