Class practical: the deflection of a compass needle increases with the current carried by a wire.
Class practical: a plotting compass and iron filings show that the shape of this magnetic field resembles that of a permanent...
Class practical: iron filings show that a long, closely wound current-carrying coil behaves just like a bar magnet.
Class practical: iron filings reveal the pattern of magnetism around a current-carrying wire, and factors that affect it.
Class practical: using a plotting compass and iron filings to explore the field pattern.
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