The theory for this experiment ignores the rotational inertia of the pendulum. because the pendulum is not really a simple pendulum (a point mass on a massless rod), a systematic error is introduced. does this simplistic analysis tend to give a launch velocity that is too high or too low?

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.