A 6V battery of negligible internal resistance is connected across a uniform wire AB of length 100 cm. The positive terminal of another battery of emf 4 V and internal resistance 1 Ω is joined to the point A as shown in figure. Take the potential at B to be zero.
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Ans.
Potential difference between 
and 
is 
.
is at 0 potential.
Thus potential of A point is 6 V .
The potential difference between Ac is 4 V .
The potential at 
Current through the resisters R1 and R2 are equal.
Thus, 
When the points C and D are connected by a wire current flowing through it is 0 since the points are equipotential.
Potential at A=6 v
Potential at C 
The potential at 
and towards A potential increases.
Thus -ve potential point does not come within the wire.
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