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A 6 volt battery of negligible internal ...

A 6 volt battery of negligible internal resistance is connected across a uniform wire AB of length `100 cm`. The positive terminal of another battery of emf 4V and internal resistance `1 Omega` is joind to the point A as shown in figure. Take the potential at B to be zero. (a) What are the potentials at the points A and C ? (b) At which D of the wire AB, the potential is equal to the potential at C. ( c) If the point C and D are connected by a wire. What will be the current through is ? (d) Id the 4V batteryt is replaced by 7.5 V battery, what whould be the answers of parts (a) and (b) ?

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The correct Answer is:
`(a) 6V, 2V; (b) AD=66.7 cm ; (c) " zero" (d) 6V, -1.5V , " no such point D exists"`
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