The core of an electromagnet is
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A coil with an iron core is called an electromagnet. The iron core increases the coil's magnetic field strength. A simple electromagnet is made by coiling wire around an iron nail.
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ᴀ ᴄᴏɪʟ ᴡɪᴛʜ ᴀɴ ɪʀᴏɴ ᴄᴏʀᴇ ɪs ᴄᴀʟʟᴇᴅ ᴀɴ ᴇʟᴇᴄᴛʀᴏᴍᴀɢɴᴇᴛ. ᴛʜᴇ ɪʀᴏɴ ᴄᴏʀᴇ ɪɴᴄʀᴇᴀsᴇs ᴛʜᴇ ᴄᴏɪʟ's ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅ sᴛʀᴇɴɢᴛʜ. ᴀ sɪᴍᴘʟᴇ ᴇʟᴇᴄᴛʀᴏᴍᴀɢɴᴇᴛ ɪs ᴍᴀᴅᴇ ʙʏ ᴄᴏɪʟɪɴɢ ᴡɪʀᴇ ᴀʀᴏᴜɴᴅ ᴀɴ ɪʀᴏɴ ɴᴀɪʟ.
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