question_answer

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross sectional area A = 10 \[c{{m}^{2}}\] and length = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is \[({{\mu }_{0}}=4\pi \times {{10}^{-7}}T\,m\,{{A}^{-1}})\]                  [AIEEE 2008]

A) \[4.8\,\,\pi \times {{10}^{-5}}H\]

B) \[2.4\,\,\pi \times {{10}^{-4}}H\]

C) \[2.4\,\,\pi \times {{10}^{-5}}H\]

D) \[4.8\,\,\pi \times {{10}^{-4}}H\]