tell me the direction..

BITSAT 2015 Papers › Electricity and magnetism questions › tell me the direction..

the current density across a cylindrical conductorof radius R varies ; j=j₀ {1-r/R} ,where r is the distance frm the axis .thus the current density is maximum j₀ at the axis r=0 and decreases linearly to zero at surface r=R calculate current in terms ot j_oand surface area of conductor is A= pi R²

#Physics #Electricity and magnetism

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4 Answers

66

kaymant ·2009-07-07 05:54:57

Use the fact that the current is the flux of the current density vector to obtain
i=\int_0^R j_0\left(1-\dfrac{r}{R}\right)2\pi r \ \mathrm{d}r

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parnika -1 ·2009-07-07 22:18:52

so here current flows radially outward....!!!

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66

kaymant ·2009-07-07 23:16:12

no..it flows parallel to the axis

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parnika -1 ·2009-07-09 09:53:09

sir can u xplain wid digram......im still confused..!

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