You are traveling in a spaceship from the Earth to Alpha Centauri when exactly half-way there you receive (at the same time) light from explosions on Earth and Alpha Centauri. Explain whether this is or is not one of those occasions when being half-way between the end-points means the events (the explosions) were simultaneous in your coordinate system. Note that this is not a yes/no question. You need to provide a reason

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.