A circular loop is conducting current in a counter-clockwise direction as shown. A number
of changes to this initial situation are described in a-e below. In each case, describe how the
proposed changes will affect the magnitude and direction of the magnetic field at the center
of the loop and explain your reasoning.
Each change below refers to the initial situation described above.
a. The current in the loop is increased.
b. The direction of the current in the loop is reversed.
c. The current in the loop is reduced and its direction reversed.
d. The radius of the loop is increased.
e. The radius of the loop is decreased and the current is increased.
f. The loop is replaced by a coil with several turns with the same radius and current.