# Does back E.M.F. create a second back E.M.F. which creates a third back E.M.F. and so on? [duplicate]

Does back E.M.F. also generate a back E.M.F. of it's own?

If so, why do I not hear this discussed? Is this because it has a very small effect, i.e. it lasts a small amount of time or it has a small magnitude.

## marked as duplicate by John Rennie electromagnetism StackExchange.ready(function() { if (StackExchange.options.isMobile) return; $('.dupe-hammer-message-hover:not(.hover-bound)').each(function() { var$hover = $(this).addClass('hover-bound'),$msg = $hover.siblings('.dupe-hammer-message');$hover.hover( function() { $hover.showInfoMessage('', { messageElement:$msg.clone().show(), transient: false, position: { my: 'bottom left', at: 'top center', offsetTop: -7 }, dismissable: false, relativeToBody: true }); }, function() { StackExchange.helpers.removeMessages(); } ); }); }); Apr 6 at 9:59

• IMO, the concept of "back EMF" only makes it harder to understand inductors and electrical machines. Take an ideal inductor, for example: The current through it and the voltage across it are related to time by, $v=L\frac{di}{dt}$. That equation is always true. There's no "back EMF" in it, but it can tell you all that you need to know. It seems to me as if, "Back EMF" is a story that instructors tell to students when they are not yet ready to teach the math. – Solomon Slow Apr 5 at 20:06