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![[Post New]](/templates/default/images/icon_minipost_new.gif) 14 Mar 2008 13:22:49 IST
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A COIL AND BULB CONNECTED IN SERIES WITH DC SOURCE, ASOFT IRON CORE IS INSERTED IN COIL THEN INTENSITY OF BULB------------------------,EXPLAIN
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15 Mar 2008 11:07:25 IST
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unchanged, as resistance of inductor is not affected by iron core in case of DC source
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"A perfect mind is a treasure unsurpassed."
"It is said that human beings have 5 senses. That's because most of them lack the 6th - common sense."
-- astatine19 --
http://astatine19.blogspot.com/
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15 Mar 2008 11:26:40 IST
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i think, that when iron core wud be inserted in the coil the flux wud increase with time and according to the lenz's law a back emf wud generated which wud make the bulb to get dimmer and when it is completely inserted the intensity will become constant.
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15 Mar 2008 15:28:37 IST
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where is there change in flux for induction to occur in a dc circuit !!!! no!! no change is observed in intensity!!!!
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15 Mar 2008 15:55:27 IST
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the change in flux wud be caused beacause soft iron core as when inserted would intesify the magnetic field crossing that certain area. ou guys telling no is because u are considering that the coil is inactive in case of dc.
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15 Mar 2008 19:48:08 IST
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no change coz inductor has no effect in the case od dc current...........and adityaraj is wrong
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16 Mar 2008 11:26:42 IST
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yeah i too agree with paddy dude!!!!
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16 Mar 2008 11:44:45 IST
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the brightness of bulb will start to build slower as compared to the case without the rod...but the FINAL intensity will be same in both cases...
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16 Mar 2008 11:49:58 IST
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no change coz in DC  =0, so XL IS ZERO!!
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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16 Mar 2008 11:52:08 IST
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but doesnt dat mean, max current will flow...........so intensity will increase?? as as inductor provides no resistance to DC!!
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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16 Mar 2008 11:52:33 IST
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Let uss try to look it at a different percpective.
When the current passes through the coil, it gets, magnetised and the magnetic potential energy stored in the coil is (LI^2)/2.
When soft iron core is introduced in, at the time of intruducing, energy is drawn by the inductor, because its inductance increases. This energy is drawn from the dc source. It implies that there will be a potentail drop buildup, across the inductor for a small duration of time, till the current is builtup back in to the initial value. That decreases the potential difference across the bulb for a short duration reducing its brightness.
OR
Introducing the soft iron in side the coil has similar effect as to increasing the magnetic field inside the coil. Which obviousely induces a back emf. Then the net potential difference across the bulb = DC emf - Back emf . This reduces the current through the bulb and its brightness for a short duration.
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