What is the magnitude of the force acting on a spring with a spring constant of 300 N/m that is stretched 15.3cm?
2.81 N
19.2 N
39.3 N
45.9 N

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.