(skip this paragraph if you just want the math) I had some free time today, so I thought I'd toy with the impossible hilarity of the Arc Reactor from the Iron Man films. My first line of calculation was on the magnetic field that would be generated if 1/10th of the power output (3 gigawatts!) were to travel through the length of wire coming out of the generator. Math: P= 3x10^8 watts V* = 250 V P=IV --> P/V=I --> (3x10^8 watts)/(250 V) --> 1,200,000 Amps I= 1,200,000 Amps R**= .05 m B= UiI/2PiR = (4π×10−7 (NA^-2))(1,200,000 A)/(2π(.05m)) B= 2.4 Teslas *(I chose this number from the voltage of an industrial electromagnet) **(roughly the distance to his heart) Now assuming this math is correct so far, how could I measure the magnetic force on the iron particles in the blood? The volume of the heart is .28 M^3 and there is ~160 grams of iron per liter, meaning there's 44.8 grams finely dispersed in solution. My guess is there's a very simple equation to figure this out, but as of now I don't know of any.