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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

LILAMAYA MISHRA , 14 Years ago
Grade 12
anser 1 Answers
AJIT AskiitiansExpert-IITD

Last Activity: 14 Years ago

                                                                     



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

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