1.

Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross-section area A = 10cm^2 and length l = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is ....... [mu_0=4pixx10^(-7) "TmA"^(-1)]

Answer»

`2.4pixx10^(-4)` H
`2.4pixx10^(-5)` H
`4.8pixx10^(-4)` H
`4.8pixx10^(-5)`H

Solution :MUTUAL inductance ,
`M=(mu_0 N_1N_2A)/l`
`=(4pixx10^(-7)xx300xx400xx10xx10^(-4))/0.2`
`=24000000 PI xx 10^(-11)`
`THEREFORE M=2.4 pixx10^(-4)` H


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