1.

Current density in a cylindrical wire of radius R is given as J={{:(J_(0)((x)/(R)-1)" for "0 lexlt(R)/(2)),(J_(0)(x)/(R)" for "(R)/(2)lexleR):} . The current flowing in the wire is :

Answer»

`(7)/(24)piJ_(0)R^(2)`
`(1)/(6)piJ_(0)R^(2)`
`(7)/(12)piJ_(0)R^(2)`
`(5)/(12)piJ_(0)R^(2)`

Solution :`I=int_(0)^(R//2)J_(0)((X)/(R)-1)2pix dx+int_(R//2)^(R)J_(0)(x)/(R)2PI x dx`


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