What are the signs of δs univ, δs surr, and δs sys, respectively, for water freezing at -10°c? a) δs univ is positive, δs surr is negative, and δs sys is positive. b) δs univ is negative, δs surr is negative, and δs sys is positive. c) δs univ is positive, δs surr is positive, and δs sys is negative. d) all three values are positive.

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