An object cannot remain at rest unless which of the following holds? a. the net force acting on it is zero. b. the net force acting on it is constant and nonzero. c. there are no forces at all acting on it. d. there is only one force acting on it.

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.