What JFET should I use to limit current from 5A to 500mA?

I’m trying to drive a motor from a voltage variable power supply but gives 5A and that’s too much for my purpose. So I think of using a JFET to limit current connected to a potentiometer to even modulate the current, but im not sure which should I use. I’d appreciate any help!

submitted by /u/Piocoto
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