To determine whether or not grade level influences time spent studying, Samuel has designed a survey. What is the response variable?

time spent studying

Step-by-step explanation:

A Response Variable is also called a dependent variable. It derives that if there is any change so what would be the response. In other words,  we can say that the variation or changes based on other variables

Therefore in the given case, the time spent studying is treated as a response variable and the same is to be considered

The electric field strength at any point from a charged particle is given by E = kq/r^2 and we can use this to calculate the field strength of the two fields individually at the midpoint. 

The field strength at midway (r = 0.171/2 = 0.0885 m) for particle 1 is E = (8.99x10^9)(-1* 10^-7)/(0.0885)^2 = -7.041 N/C and the field strength at midway for particle 2 is E = (8.99x10^9)(5.98* 10^-7)/(0.0935)^2 = -7.041 N/C

Note the sign of the field for particle 1 is negative so this is attractive for a test charge whereas for particle 2 it is positive therefore their equal magnitudes will add to give the magnitude of the net field, 2*7.041 N/C = 14.082 N/C