Two batteries of different emfs and different internal resistances are connected as shown. The voltage across $A B$ in volt is

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Two batteries of different emfs and different internal resistances are connected as shown. The voltage across A B in volt is

Quantrex Academy · Accepted Answer

Correct answer: 5

V_ A B = Equivalent emf of two batteries in parallel. aligned & =(E_1 / r_1+E_1 / r_2)/(1 / r_1+1 / r_2) & =((6 / 1)+(3 / 2))/((1 / 1)+(1 / 2))=5 ~V aligned Answer is 5 . Analysis of Question (i) In my opinion this is the simplest question of JEE 2011. (ii) When no current is drawn from this equivalent battery, then V_ A B =V=E Otherwise, V=E ± ir (iii) Similar type of question was asked in JEE 1981 and cancelled paper of JEE 1997.

Two batteries of different emfs and different internal resistances...

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