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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Mar 2008 17:21:12 IST
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well i thought so and reffered a guide mbd. in there also they had given just what i thought..
pls confirm it or correct me if wrong...
sample paper 3
Q 14. air cored solenoid connected to dc battery series bulb
if switch closed what happens???
i feel it glows brightly no change even if iron brought inside core as anyway no resistance offered to dc current...
Q 8. input A MUST b 0..
for none of them A needs to b 0 rite when B is 0 if A is 1 also nand gate output is 1 rite???
18) D ( distance frm screen ) omitted but thats okey...
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" From ashes a fire shall be woken From shadows a light shall spring " ---Tolkien
" Throughout the centuries there were men who took first steps down new roads armed with nothing but their own vision. " --- Ayn Rand
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5 Mar 2008 17:40:23 IST
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u r correct
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5 Mar 2008 17:45:59 IST
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ur correct man
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5 Mar 2008 18:31:32 IST
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u r right
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5 Mar 2008 18:52:04 IST
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thanks guys
can't beleive CBSE issued something like this..
for our cbse paper ie boards they'll ensure higher stds????
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" From ashes a fire shall be woken From shadows a light shall spring " ---Tolkien
" Throughout the centuries there were men who took first steps down new roads armed with nothing but their own vision. " --- Ayn Rand
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5 Mar 2008 18:57:55 IST
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well actually the bulb starts glowing slowly only...as current does not reach the maximum value inst..during that proces when u intro. a rod, self infduced emf will increase and the bulb will appear still dimmer..but when steady state is reached,it doesnt matter whther the rod is in r not as the flux remains a constant
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kaushik krishna .R
bits pilani
mech engg |
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5 Mar 2008 23:09:46 IST
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BUT Isn't that only for ac??????
dc it is 0 resistance!!!!!!! self inductance doesn't affect DC.
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" From ashes a fire shall be woken From shadows a light shall spring " ---Tolkien
" Throughout the centuries there were men who took first steps down new roads armed with nothing but their own vision. " --- Ayn Rand
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8 Mar 2008 22:08:49 IST
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resistance is 0 if u consider it as RESISTANCE in ohms...
an inductor is kinda resistance too...it has a back emf due to changing magnetic flux.....due to this current increases slowly....
if we insert a rod inside solenoid...flux changes at faster rate...so bulb should glow faster than before....
(or the flux may increase at a slower rate...i don't really know...then it would be opposite)
but still final current will be same in both cases because in steady state , u can say that resistance offered due to inductor vanishes.....because flux becomes constant...
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