A cell of emf 3.4 volt and internal resistance 3 Ω Ω connected to an ammeter having resistance 2 Ω Ω and to an external resistance of 100 Ω Ω . When a voltmeter is connected across the 100 Ω Ω resistance the ammeter reading is 0.04 ampere. Find the voltage read by the voltmeter and its resistance. Had the voltmeter been an ideal one, what would have been its reading.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(400 Ω Ω , 
= 3.2 V, 
= 3.238 V)
Sol. E = 3.4 volt, r = 3 Ω Ω , R A = 2 Ω Ω , R = 100 Ω Ω .
i 1 = 0.04 A, V = ?, R V = ?
0.04 = 
5 + 
= 
= 85
R V = 400 Ω Ω Ans.
V = 0.04 × 
V = 3.20 V Ans.
For ideal voltmeter
R v → ∞
i = 
= 
V = i × 100 = 
× 100 = 
V Ans.
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