Search any question & find its solution
Question:
Answered & Verified by Expert
A potential difference across the terminals of a battery is $50 \mathrm{~V}$ when 11 A current is drawn and $60 \mathrm{~V}$,when 1 Acurrent is drawn. The emf and the internal resistance of the battery are
Options:
Solution:
2988 Upvotes
Verified Answer
The correct answer is:
$61 \mathrm{~V}, 1 \Omega$
For a closed circuit cell supplies a constant current in the circuit.
For cell $\mathrm{E}=\mathrm{V}+\mathrm{Ir}$
For $\mathrm{V}=50 \mathrm{~V}$
$E=50+11 r$
Similarly, for $\mathrm{V}=60 \mathrm{~V}$
$E=60+r$
From eqs. (i) and (ii), we get $E=61 \mathrm{~V}$
For cell $\mathrm{E}=\mathrm{V}+\mathrm{Ir}$
For $\mathrm{V}=50 \mathrm{~V}$
$E=50+11 r$
Similarly, for $\mathrm{V}=60 \mathrm{~V}$
$E=60+r$
From eqs. (i) and (ii), we get $E=61 \mathrm{~V}$
Looking for more such questions to practice?
Download the MARKS App - The ultimate prep app for IIT JEE & NEET with chapter-wise PYQs, revision notes, formula sheets, custom tests & much more.