Please give a quick explanation to which one is the right an

Solution

1.

The electric potential is defined as follows

V= U/q

From the above relation we can say that the potential energy per unit charge is defined as electric potential.

Other definition for the electric potential is, the work done to move the charge from infinite to the field point. Hence the work done on the charge is also definition for the electric potential.

J/C is one of the unit of potential.

Hence a and b are correct

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Current is not remains the same.

Option b is correct.

The wires are connected in parllel with battery, so the batter gives the same potential difference.

The electric field E=V/d depends on the potential difference and length of the wire, so this is also remains the same.

The current density and the electron drift velocity depend on the electric field, so they are remain the same.