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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


Grade:12

1 Answers

AJIT AskiitiansExpert-IITD
68 Points
11 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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