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 × 10^5 newtons/coulomb. what is the magnitude of charge on this van der graff generator? a. 1.7 × 10^-7 coulombs b. 2.8 × 10^-7 coulombs c. 3.0 × 10^-7 coulombs d. 8.5 × 10^-7 coulombs

B.

Explanation:

As we know that the electric field due to Van de graff generator is same as that of a point charge

so it is given by

here we know that

also we know that

now from above formula we have

here we will have

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.