Explain whether P waves or S waves are infra sound

 S-waves only travel through solids, and  P-waves can travel through solids and liquids. So S-waves because they can also be classified as  infrasound waves.

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~Jarvis

Explanation:

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.