Neet Solved Paper 2013 Question 26
Question: The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of $ 10,\Omega $ is
Options:
A) $ 0.2,\Omega $
B) $ 0.5,\Omega $
C) $ 0.8,\Omega $
D) $ 1.0,\Omega $
Show Answer
Answer:
Correct Answer: B
Solution:
- As $ l=\frac{E}{R+r} $ or $ E=l(R+r) $ $ 2.1=0.2(10+r) $ $ 10+r=\frac{2.1}{2}\times 10 $
$ \therefore $ $ r=10.5-10=0.5,\Omega $
