\r\n\u003Cbr />\r\nThe magnetic field created by a magnet acts at a distance, and can be observed using an array of compasses. A single click shows how those lines of force are arranged around the magnet. Note that these lines are attached to the magnet.\u003C/p>",[1666,1676,1687,1698,1701,1710],{"id":1667,"title":1668,"slug":1669,"mediaType":752,"thumbnailSizes":1670,"thumbnailBackground":827,"publishedAt":1674,"isExpert":761,"goals":1675},260,"Earth's magnetic field","earth-s-magnetic-field",{"node_pack":1671,"suggestion":1672,"title":1673},"/media-cache/media_thumbnail_node_pack/uploads/media/thumbnails/260-6545f2fc0493e371923389.webp","/media-cache/media_thumbnail_suggestion/uploads/media/thumbnails/260-6545f2fc0493e371923389.webp","/media-cache/media_thumbnail_title/uploads/media/thumbnails/260-6545f2fc0493e371923389.webp",{"date":759,"timezone_type":446,"timezone":760},"\u003Cul>\r\n\t\u003Cli>To view the geometry of the Earth's magnetic field.\u003C/li>\r\n\t\u003Cli>To show that the compass remains parallel to the field lines at every point.\u003C/li>\r\n\t\u003Cli>To distinguish geographic poles and magnetic poles.\u003C/li>\r\n\u003C/ul>",{"id":1677,"title":1678,"slug":1679,"mediaType":752,"thumbnailSizes":1680,"thumbnailBackground":1684,"publishedAt":1685,"isExpert":761,"goals":1686},324,"Bar magnet #2","bar-magnet-2",{"node_pack":1681,"suggestion":1682,"title":1683},"/media-cache/media_thumbnail_node_pack/uploads/media/thumbnails/324-6545f31f3292f923664524.webp","/media-cache/media_thumbnail_suggestion/uploads/media/thumbnails/324-6545f31f3292f923664524.webp","/media-cache/media_thumbnail_title/uploads/media/thumbnails/324-6545f31f3292f923664524.webp","#f6adcd",{"date":759,"timezone_type":446,"timezone":760},"\u003Cul>\r\n\t\u003Cli>To visualize the action at a distance created by a magnet.\u003C/li>\r\n\t\u003Cli>To show how the lines of force reveal the geometry of a magnetic field. The compass needle remains parallel to the field lines.\u003C/li>\r\n\t\u003Cli>To show that the lines of force are intrinsic to a magnet.\u003C/li>\r\n\u003C/ul>",{"id":1688,"title":1689,"slug":1690,"mediaType":752,"thumbnailSizes":1691,"thumbnailBackground":1695,"publishedAt":1696,"isExpert":761,"goals":1697},364,"Magnets","magnets",{"node_pack":1692,"suggestion":1693,"title":1694},"/media-cache/media_thumbnail_node_pack/uploads/media/thumbnails/364-6545f336f2a4e085449998.webp","/media-cache/media_thumbnail_suggestion/uploads/media/thumbnails/364-6545f336f2a4e085449998.webp","/media-cache/media_thumbnail_title/uploads/media/thumbnails/364-6545f336f2a4e085449998.webp","#b41d8d",{"date":759,"timezone_type":446,"timezone":760},"\u003Cul>\r\n\t\u003Cli>To introduce the notion of lines of force or field lines.\u003C/li>\r\n\t\u003Cli>To teach that magnetic force is an action at a distance whose intensity decreases with increasing distance.\u003C/li>\r\n\u003C/ul>",{"id":799,"title":800,"slug":801,"mediaType":752,"thumbnailSizes":1699,"thumbnailBackground":806,"publishedAt":1700,"isExpert":761,"goals":786},{"node_pack":803,"suggestion":804,"title":805},{"date":759,"timezone_type":446,"timezone":760},{"id":239,"title":1702,"slug":1703,"mediaType":752,"thumbnailSizes":1704,"thumbnailBackground":795,"publishedAt":1708,"isExpert":761,"goals":1709},"Loudspeaker","loudspeaker",{"node_pack":1705,"suggestion":1706,"title":1707},"/media-cache/media_thumbnail_node_pack/uploads/media/thumbnails/356-6545f33129640347594628.webp","/media-cache/media_thumbnail_suggestion/uploads/media/thumbnails/356-6545f33129640347594628.webp","/media-cache/media_thumbnail_title/uploads/media/thumbnails/356-6545f33129640347594628.webp",{"date":759,"timezone_type":446,"timezone":760},"\u003Cul>\r\n\t\u003Cli>To illustrate the propagation of a sound wave.\u003C/li>\r\n\t\u003Cli>To discover the principles underlying the functioning of a 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