At a distance of 0.75 meters from its center, a van der graff generator interacts as if it were a point charge, with that charge concentrated at its center. a test charge at that distance experiences an electric field of 4.5 × 105 newtons/coulomb. what is the magnitude of charge on this van der graff generator?

a. 1.7 × 10ˆ-7 coulombs
b. 2.8 × 10ˆ-7 coulombs
c. 3.0 × 10ˆ-7 coulombs
d. 8.5 × 10ˆ-7 coulombs

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?