What do mammoths and tigers need energy for

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 higher the current the higher the mag field around it the higher the influence on the compass

wavelegth as in spectrum red oygbiv

answera compound;