A 90kg boy and a 60kg girl, both wearing skates, face each other at rest on a skating rink. The boy pushes the girl, sending her eastward with a speed of 3 m/s.
Neglecting friction, determine the velocity of the boy. *
*
A) 8m/s
B) 2m/s
C) 3m/s
D) 7m/s

option b is the answer of your question

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.