Which of the collisions below should definitely be treated as inelastic collisions?

(A)A cream pie (TM) hitting a clown at 5 MPH
(B)Two cars hitting each other head on at 15 MPH
(C)A bowling ball hitting a pin at 20 MPHTwo pool balls hitting each other head on at 10 MPH
(D)A superball hitting a concrete wall at 10 MPH
(E)A piece of clay going 10 m/s hitting a stationary bowling ball

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.

the answer is b, have negligible mass