A test charge of 5 µC is placed halfway between a charge of 10 µC and 15 µC separated by 5 cm. What is the magnitude of the net force on test charge? a.
720 N

b.
-360 N

c.
1080 N

d.
360 N

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

i think it would be 5