If the outer and the inner diameter of a coaxial transmission line are 20 mm and 10 mm respectively, then the inductance /m of the transmission line is:

• A. 0.13 ¬¨¬®¬¨¬µH
• B. 0.2 ¬¨¬®¬¨¬µH
• C. 0.3 ¬¨¬®¬¨¬µH
• D. 0.1 ¬¨¬®¬¨¬µH