{"id":122645,"date":"2015-09-08T02:00:00","date_gmt":"2015-09-07T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=d9436caed439e39c4303175788f9927c"},"modified":"2015-09-08T02:00:00","modified_gmt":"2015-09-07T23:00:00","slug":"can-a-moving-charge-or-a-varying-dipole-produce-a-constant-field","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=122645","title":{"rendered":"Can a moving charge or a varying dipole produce a constant field?"},"content":{"rendered":"<p>Although the electromagnetic field of a given distribution of charge and current is unambiguously<br \/>\ndefined by the Maxwell equations, there is no unique inverse correspondence between this field and<br \/>\npoint-like sources. We prove this statement for electric and magnetic dipoles and discuss two<br \/>\nexamples when the same field at some point or in some region is generated by either a dipole or an<br \/>\nelectric charge that are varying in different ways. The electric and magnetic fields of the charge<br \/>\ndepend on its speed and the distance between the charge and the observation point. It is shown that<br \/>\nit is possible to find a law of motion for the charge in which the variation in the distance to the<br \/>\nobserver is compensated for by variation in the velocity of the charge. One particular example of<br \/>\nthe motion of a charge is discussed, wherein the electric and magnetic fields at a specific point of<br \/>\nobservation remain constant. The issues discussed could be of interest to both scientists and<br \/>\nscholars.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Although the electromagnetic field of a given distribution of charge and current is unambiguously<br \/>\ndefined by the Maxwell equations, there is no unique inverse correspondence between this field and<br \/>\npoint-like sources. We prove this statement for elect&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-122645","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/122645","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=122645"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/122645\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=122645"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=122645"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=122645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}