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When a currentof 2Aflows in a batteryfromnegative to positive terminal, thepotential difference across it is 12V. If a current of 3Aflowing in the opposite direction produces a potential difference of 15V, the EMF of the battery is (A) 12.6 V (B) 13.2 V (C) 13.5 V (D) 14.0 V
When a currentof 2Aflows in a batteryfromnegative to positive terminal, thepotential difference across
it is 12V. If a current of 3Aflowing in the opposite direction produces a potential difference of 15V, the
EMF of the battery is
(A) 12.6 V (B) 13.2 V (C) 13.5 V (D) 14.0 V
Dear LILAMAYA MISHRA,As the voltage developed across the battery depends upon the direction of current there will be an internal resistance in the battery which probably you might be missing. take that to be r , let the EMF of the battery to be E , writing equations , - to + flow of current INSIDE THE BATTERY ----- E - 2 *r =12 +to - flow of current ------ E + 3 * r =15 solve the equations --- E =13.2 V Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation. Now you can win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.
As the voltage developed across the battery depends upon the direction of current there will be an internal resistance in the battery which probably you might be missing. take that to be r , let the EMF of the battery to be E ,
writing equations ,
- to + flow of current INSIDE THE BATTERY ----- E - 2 *r =12
+to - flow of current ------ E + 3 * r =15
solve the equations ---
E =13.2 V
Please feel free to post as many doubts on our discussion forum as you can. We are all IITians and here to help you in your IIT JEE preparation. Now you can win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.
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