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La figura muestra la seccin transversal de un conductor cilindrico muy largo. Por el conductor interior de radio R, fluye una corriente en direccin

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La figura muestra la seccin transversal de un conductor cilindrico muy largo. Por el conductor interior de radio R, fluye una corriente en direccin saliente de manera que su densidad corriente est dada por Jl(r) = r2. Por Otra parte, por el conductor exterior, de radio interno R y externo 2R, circula una corriente en direccin entrante, distribuida uniformemente por toda su superficie, de manera que J2(r) = a r3. Para ambas expresiones, "r" es la minima distancia al eje central de conductor. a) Calcule una expresin para la magnitud del campo magntico en r R/2 b) Calcule una expresin para la magnitud del campo magntico en r 3R/2 c) Determine la razon para que la magnitud del campo magntico en r 3R sea cero

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