The current in the radial distributor refers to the flow of electric current through the various branches or arms of the distributor. The radial distributor is typically a network of parallel branches connected to a common source at one end. Each branch supplies power to a different load or consumer.

The current in the radial distributor is influenced by several factors, including the resistance and impedance of the branches, the voltage supplied by the source, and the overall distribution of loads.

Now, let's analyze the options given:

a) Source end of the distributor: In a radial distribution system, the source end is where the power is supplied to the distributor. Since all the branches are connected in parallel, the current from the source is divided among the branches based on their individual resistances and impedances. At the source end, the current is at its maximum because it is the starting point of the distribution network.

b) Midpoint of the distributor: The midpoint of the distributor is where the current from the source is divided equally among the branches. However, this does not necessarily mean that the current is at its maximum at this point. The current at the midpoint depends on the overall distribution of loads and the impedance of the branches.

c) End-point of the distributor: The end-point of the distributor is where the branches terminate and supply power to the loads or consumers. The current at the end-point is determined by the total resistance and impedance of the branches connected to it. However, it is not necessarily at its maximum at this point.

Based on the above analysis, the correct answer is option 'a' - the current in the radial distributor will be maximum at the source end of the distributor. This is because the source end is where the current is initially supplied, and it is divided among the branches based on their individual resistances and impedances. At the source end, the current is at its maximum before being distributed to the different branches.