If a turtule walks at a rate of 4mph is it a speed or velocity

speed

Explanation:

Velocity has magnitude and direction.

Speed has only magnitude.

Since no direction is given, 4mph is the turtle's speed.

speed

Explanation:

It is speed because there's no direction indicated

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.