Physics
A straight wire is passed vertically through cardboard sprinkled with iron filings.
(a) When current is passed through the wire in the upward direction, it is seen that the iron fillings are arranging themselves in a definite pattern. Why?
(b) What would happen to this arrangement if more current were passed through the wire?
Electro-Magnetism
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Answer
(a) When current flows upward through the vertical wire, it creates a circular magnetic field around the wire (as per right-hand thumb rule). The iron filings are tiny magnets in the presence of magnetic field and they align themselves along these field lines, forming concentric circles.
(b) The concentration of magnetic field lines will increase/the number of concentric circles will increase up to a greater distance.
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