1 . a solenoid with a core of magnetic material electromagnet
2 . a coil of current-carrying wire which produces a magnetic field electromagnetic induction
3 . a device for detecting small amounts of current galvanometer
4 . the creation of an electric current in a circuit exposed to a changing magnetic field solenoid

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

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