When an iron rod is placed inside a current carrying coil of wire the coil becomes an electromagnet more current is required to increase its magnetic strength only then does the coil have a north and south magnetic pole the coil becomes a stronger electromagnet

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When an iron rod is placed inside a current carrying coil of wire            the coil becomes an electromagnet more current is required to increase its magnetic strength only then does the coil have a north and south magnetic pole the coil becomes a stronger electromagnet

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Question: When an iron rod is placed inside a current-carrying coil of wire _________. the coil becomes an electromagnet more current is required to increase its

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