ELECTRICITY AND MAGNETISM - MAGNETIC FIELDS AND FORCES - MAGNETIC FIELDS	NC State University Faculty Access
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Description: Iron filings suspended in oil react to a magnet when put in the center of the container. The filings generally show the magnetic field lines. Parts: Container with oil and filings. "Cow magnet". Purchased/Built: purchased Quant. in Demo Room: 1 Demo References Sutton E-90 Soft iron bars extend the poles of a permanent magnet into a projection cell with iron filings in a equal mixture of glycerin and alcohol. The American Journal of Physics AJP 38(6),777 A sandwich of iron filings in glycerine between two glass plates. The American Journal of Physics AJP 36(11),1015 A suspension of carbonyl nickel powder in silicon oil is used as an indicator of magnetic field.
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