1.

A long solenoid with 40 turns per cm carries a current of 1A. The magnetic energy stored per unit volume is __________J//m^(3)

Answer»

`3.2pi`
`32pi`
`1.6pi`
`64pi`

Solution :`n=(40)/((10))=4XX10` /METRE, B (long solenoid) = `munI`
Energy per UNIT volume = `(1)/(2mu_(0))B=(1)/(2mu_(0))(munI)=(n^(2)I^(2))/(2)`
`=(4pixx10^(7)XX(4xx10^(3))xx(1))/(2)`
`=32pixx10^(-1)=3.2piJm^(-3)`


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