Eight cells marked 1 to 8 , each of emf 5 V and internal resistance 0.2 Ω are connected as shown. What is the reading of ideal voltmeter?

Question

Eight cells marked 1 to 8 , each of emf 5 V and internal resistance 0.2 Ω are connected as shown. What is the reading of ideal voltmeter? (A) 40 V (B) 20 V (C) 5 V (D) Zero

Tardigrade Admin · Accepted Answer

Current flowing in circuit i=(n E/n r)=(5/0.2)=25 A Terminal potential difference across the terminals of battery numbered 8 , V=E-i r=5-25 × 0.2=0 V=0 Hence, voltmeter reading is zero. So, choice

Q. Eight cells marked $1$ to $8$ , each of emf $5 V$ and internal resistance $0.2 Ω$ are connected as shown. What is the reading of ideal voltmeter?

40 V

20 V

5 V

Zero

Current flowing in circuit
$i = \frac{n E}{n r} = \frac{5}{0.2} = 25 A$
Terminal potential difference across the terminals of battery numbered 8 ,
$V = E - i r = 5 - 25 \times 0.2 = 0$
$V = 0$
Hence, voltmeter reading is zero. So, choice

Q. Eight cells marked 1 to 8 , each of emf 5V and internal resistance 0.2Ω are connected as shown. What is the reading of ideal voltmeter?

40 V

20 V

5 V

Zero

Current flowing in circuit i=nrnE​=0.25​=25A Terminal potential difference across the terminals of battery numbered 8 , V=E−ir=5−25×0.2=0 V=0 Hence, voltmeter reading is zero. So, choice

Q. Eight cells marked $1$ to $8$ , each of emf $5 V$ and internal resistance $0.2 Ω$ are connected as shown. What is the reading of ideal voltmeter?

Current flowing in circuit
$i = \frac{n E}{n r} = \frac{5}{0.2} = 25 A$
Terminal potential difference across the terminals of battery numbered 8 ,
$V = E - i r = 5 - 25 \times 0.2 = 0$
$V = 0$
Hence, voltmeter reading is zero. So, choice