Suppose you could suddenly increase the speed of every molecule in a gas by a factor of 2. Would the gas pressure increase by a factor of 2 1/2, 2, or 2^2?

Explanation:

The gas pressure is directly proportional to the mean root square velocity of the constituent molecules of gas .

P ∝      I

Here C₁ , C₂ ------------ Cₙ is the velocities of molecules .

By making these velocities double

The pressure P₀ ∝ 2          II

By dividing II by I

P₀ = 2 P

Thus pressure will become double than its previous value

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.