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Question

A cell has terminal voltage 2V in open circuit and internal resistance of the given cell is 2Ω. If 4A of current is flowing between points P and Q in the circuit and then the potential difference between P and Q is
640476_18cc124b36a749a8bdd1c19539a3cc05.jpg

A
22V
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B
24V
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C
30V
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D
26V
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Solution

The correct option is A 26V
Key Point : Find the terminal potential difference in case of charging a battery.
According to question, it is the case of charging of battery. So, terminal potential difference is given by
TPD=VPVR=E+Ir=2+(4×2) =10V....(i)
Again, VRVQ=IR=4×4=16V....(ii)
From Eqs. (i) and (ii), we get
VPVR+VRVQ=10+16VPVQ=26V
681815_640476_ans_14010f21b4d7401897bd9ad6db59ecbd.jpg

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