Question

22. In the situation shown, the potential difference across the cell of smaller e.m.f. is
(1) 2v
(2) 4V
(3) Zero
(4) 6V​

Answer 1

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Physics

Current Electricity

EMF, Terminal Voltage and Internal Resistance and Problems on It

In the situation shown, the...

PHYSICS

In the situation shown, the potential difference across the cell of smaller e.m.f. is

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ANSWER

Equivalent resistance,

All the resistors are in series

⇒Req=1+2+1=4Ω

Equivalent voltage,

As both batteries are connected opposite

⇒Veq=10−2=8V

So, current in the circuit

V=IR(Ohm's law)

8=I×4

I=2A

By KVL

VA−2+2×1=VR

VA−VB=2−2=0

Thus, potential difference across smaller cell is VA−VB=OV.