A length of copper wire carries a current of i A uniformly distributed through
its cross section,what is the energy density of the magnetic field at the
surface of the wire?(the wire diameter is 2R)
u(i^2)
答案給─────
8(R^2)
請問是不是少除了pi平方?
還是在下觀念有誤....煩請高手指點...感恩
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