Starting from rest, a car attains a velocity of 8 m/s in 30 s. After that it slows down uniformly to 5 m/s in next 5 s. Calculate the acceleration in both the cases.

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.

probably not if net force is zero

conduction, convection, radiation