A `6V` battery of negligible internasl resistance is connected across a uniform wire `AB` of length `10 cm`. The positive terminal of another battery of emf `4 V` and internal resistance `1Omega` is joined to the point A as shown in figure. Take the potentail at B to be zero.

a. What are the potential at the ponts `A` and `C`?
b. At which point `D` of the wire `AB`, the potential is equal to the potential at `C`?
c. If the points `C` and `D` are connected by a wiere, what will be the current through it ?
d. If the `4V` battery is replaced by `7.5 V` battery, what would be the answer of parts (a) and (b)?

Options

A. zero
B. `1 A`
C. `2 A`
D. `3 A`