Juan and billy hooked a science book on the end of this spring scale. what is the force of gravity pulling down on the books?

Which two particles are found in the center of an atom

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

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.