I am using a LightingWill Waterproof IP67 LED Power Supply:
https://www.amazon.ca/gp/product/B07T1WRQ4H/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
to power a magnetohydrodynamic drive with a circuit diagram that looks like this:
the solenoids are wrapped around a bunch of iron nails as the core and the electrodes are copper tapes. The direction of current and magnetic field is shown in the circuit diagram (yellow is current, cyan is magnetic field). The whole apparatus submerged in saturated salt water. By the left hand rule, when electricity passed through the salt water, they should be propelled by Ampere force with the direction being perpendicular to the screen and out. However, when I connected everything and plug the power supply into the kitchen socket, nothing happens and there is no voltage inside the circuit. I tested the resistance at the joints between the solenoid branch and the electrode branch and received a resistance at 0.01 ohm. When I disconnect my apparatus and just plug in the power supply, the voltage at the power supply output (the red and black wire) is 12 V, that means the power supply is working. So why didn't I get current into my apparatus? I used 18 AWG wire for my electrode branch (this is the wire that also connects to the power supply) and 12 AWG wire for my electromagnet solenoid.
