MCQ
Three identical cells are connected in parallel across $A B$. Net emf across $A B$ is .......... $V$


- ✓$10$
- B$30$
- C$15$
- D$12$

$E_{\text {net }}=\frac{\frac{10}{3}+\frac{10}{3}+\frac{10}{3}}{\frac{1}{3}+\frac{1}{3}+\frac{1}{3}}=10$ volt
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$(I)$ All radioactive elements decay exponentially with time
$(II)$ Half life time of a radioactive element is time required for one half of the radioactive atoms to disintegrate
$(III)$ Age of earth can be determined with the help of radioactive dating
$(IV)$ Half life time of a radioactive element is $50\%$ of its average life periodSelect correct answer using the codes given belowCodes :



