Which would be more difficult to stop (greatest momentum),a .44 magnum bullet with 4kg mass and a velocity of 16,500 m/s or a 2,000 kg truck moving with a velocity 35 m/s?

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.