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2. A very long cylindrical cable is composed of an inner solid cylinder of radius R1...

2. A very long cylindrical cable is composed of an inner solid cylinder of radius R1 and an outer hollow cylinder of radius R2. An electrical current runs through the inner wire and returns through the outer wire.(a) Write down the magnetic energy density function for both inner and outer regions of the cable.(b) What is the energy per unit length L, for all regions (for inner and outer regions)
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