Halliday version:
 1 The center of the loop is at X = 0, Y = 0. The magnetic field at this point can be calculated using the equation B = moI / 2r, where r is the radius of the loop. It is more challenging to determine the field at other places, but it can be done using the Biot-Savart Law. Look up the Biot-Savart Law in your textbook, calculate the magnitude of the magnetic field at X = 0, Y = 1 m, and see if your answer agrees with that given by the simulation at that point.
 2 Doubling the current doubles the magnitude of the magnetic field. Does doubling the current affect the shape of the magnetic field in any way? What is the shape of the magnetic field determined by?

Cutnell version:
 1 The center of the loop is at X = 0, Y = 0. The magnetic field at this point can be calculated using the equation B = moI / 2r, where r is the radius of the loop. Calculate the field at the center of the loop and compare it to the field determined by the simulation.
 2 Doubling the current doubles the magnitude of the magnetic field. Does doubling the current affect the shape of the magnetic field in any way? What is the shape of the magnetic field determined by?