Which of the following types of models could be used to represent a cell? a.
idea model
b.
physical model
c.
computer model
d.
all of the above

c.the charges if the proton and electron and gravity

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.