Amperes law is often written ΦB(r).dl = µoI_enclosed.

The integral throughout the chosen volume.
A. the surface integral over the open surface.
B. the surface integral over the closed surface bounded by the loop.
C. the line integral along the closed loop.
D. the line integral from start to finish.

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.