Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. with time, charge gradually leaks off of both spheres. when each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be
a) 1/16 fb) 1/8 fc) 1/2 fd) 1/4 f

c) 1/4F

Explanation: In order to explain this result we must use the Coulomb force expression, that is:

F=(k*q1*q2)/d^2 where d is the distance between spheres, k a constant equal to 9*10^9N^2.m^2/C

after time each sphere lost haft of original charge and taking into account that F is directly proportional to charge of each sphere,

we have Fafter=(k*q1/2*q2/2)/d^2

then Fafter=(1/4)(k*q1*q2)/d^2=(1/4)Finitial

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles