阿摩線上測驗
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阿摩線上測驗
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15.5te The current cofrentdesty density J inside a long sond solid cylindrical wire of radius a is in the direction of the central axis. Its magnitude varies linearly with radial distance r from the axis, J = Jor/a, i.c. J=0atr=0 a 0 and J = Jo atr= r a. Find the magnetic field in all space.