The emf ε and the internal resistance r of the battery shown in figure are 4.3 V and 1.0 Ω Ω respectively. The external resistance R is 50 Ω Ω . The resistances of the ammeter and voltmeter are 2.0 Ω Ω and 200 Ω Ω respectively.
A
Find the readings of the two meters.
B
The switch is thrown to the other side. What will be the readings of the two meters now? 
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
[ 0.1 A, 4.0 V, 0.08 A, 4.2 V]
Sol.
R eq = 1 + 2 + 
= 43
i = 
= 0.1 A Ans.
V = 40 × 0.1 = 4V Ans.
R eq = 1 + 
= 
i = 
= 
⇒ i A = 
= 0.08 A Ans.
V= 4.3 – i × 1 = 4.2 V Ans.
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