The magnetic flux through a loop perpendicular to a uniform magnetic field will change a. if the loop is replaced by two loops, each of which has half of the area of the original loop. b. if the loop moves at constant velocity in a direction parallel to the axis of the loop while remaining in the uniform magnetic field. c. if the loop moves at constant velocity while remaining perpendicular to and within the uniform magnetic field. d. if the loop is rotated through 180 ˚ about an axis through its center and in the plane of the loop. e. in none of the above cases.