Question: When a large, time- varying current fl ows through a coil, a piece of steel placed within the coil will quickly become red hot (Fig.

When a large, time- varying current fl ows through a coil, a piece of steel placed within the coil will quickly become red hot (Fig. Q21.17). Why? If a piece of copper were placed in the coil, would the effect be the same? Explain.

Figure Q21.17

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