When a current of 2, A flows in a battery from negative to positive terminal, the potential difference across it is 12, V. If a

Q: When a current of $2\, A$ flows in a battery from negative to positive terminal, the potential difference across it is $12\, V$. If a current of $3 \,A$ flows in the opposite direction potential difference across the terminals of the battery is $15\, V$, the $emf$ of the battery is ................ $\mathrm{V}$

b $\mathrm{T} . \mathrm{P.D.}=\mathrm{E}-\mathrm{I} \mathrm{r} \Rightarrow 12=\mathrm{E}-2 \mathrm{r}$ ..........$(1)$ $\mathrm{T.P.D.}=\mathrm{E}+\mathrm{Ir} \Rightarrow 15=\mathrm{E}+3 \mathrm{r} $ .........$(2)$ Solve ${\rm{e}}{{\rm{q}}^n}$ $(1)$ and $(2)$

SECTION - A [PHYSICS MCQ]

GSEB - English Medium

When a current of $2\, A$ flows in a battery from negative to positive terminal, the potential difference across it is $12\, V$. If a current of $3 \,A$ flows in the opposite direction potential difference across the terminals of the battery is $15\, V$, the $emf$ of the battery is ................ $\mathrm{V}$

A$12.6$
B$13.2 $
C$13.5$
D$14$

Diffcult

STD 11 Science
JEE
STD 12 - 3. current electricity
Physics

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