Which two statements are true? select all that apply. select one or more: a. a moving magnetic field creates an electric field. b. a constant magnetic field creates an electric field. c. a constant electric field creates a magnetic field. d. a moving electric field creates a magnetic field.

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600