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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: ANOTHER PROB ON KIRCHOFF'S LAWS
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[Post New]3 Mar 2008 11:59:15 IST
    Subject: ANOTHER PROB ON KIRCHOFF'S LAWS
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1_2_sai (0)

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if the resistance across a 12v source is increased by 4 ohm,the current drops by 0.5 ohm .the original resistance was----
1. 8 ohm
3. 4 ohm
3. 16 ohm
4. 24 ohm
    
[Post New]3 Mar 2008 12:53:50 IST
    Subject: Re:ANOTHER PROB ON KIRCHOFF'S LAWS
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nandithac (86)

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initially;
12=iR-----------------------------------------------------------------(1)
AFTER INCREASING R BY 4;
12=(i-0.5)(R+4)
12=iR+4i-0.5R-2_-------------------------------------------------(2)
sustitute eqn 1 in 2 n solve u'll get 8 as the answer
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