Write an expression for the force exerted on a charge q which is moving at velocity v by: 1. An electric field E⃗ 2. A magnetic field B⃗ 3. If an electric field and a magnetic field are both present, would a force be exerted on the charge even if the charge were initially not moving? Explain your reasoning

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.