Test Index

NCERT Class XII Chapter
Current Electricity
Questions With Solutions

© examsnet.com
Question : 1 of 24
Marks: +1, -0
The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery?
Solution:  
The maximum current will be obtained when no external resistance is offered by wire joining the two terminals.
I = ERext+r\frac{E}{R_{ext}+r} ⇒ I = 120.4\frac{12}{0.4} = 30 A (Since RextR_{ext} = 0)
© examsnet.com
Go to Question:
Next Question