Suppose a current is flowing in an infintessimally small diameter wire. The magnetic field strength at a given point is proportional to the current flow
and inversely proportional to the perpendicular distance to the wire. But this means
as the point approaches the wire, the magnetic field strength goes to infinity.
Something is not right. Please explain.

The answer to this is decibel

Sorry i don’t know what to do

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.