File talk:Rail gun.jpg

Mistake in the intensity arrow

If the circle on the left is a battery, from right-hand rule, the intensity should be in the reverse way : B down (in 3D), F right, I down (in 2D). Also please add + - poles.

If the circle on the left is not an electric supply but a volt-meter, manually moving the rail to the right makes the current this correct way (left-hand rule).

So this picture is ambiguous, but is mainly used to illustrate the first use, with a battery and an electric motor (e.g. fr:Force de Laplace).

Jack ma (talk) 10:30, 12 February 2017 (UTC)

You wrote that the picture is "mainly used to illustrate (battery and motor)". The word "mainly" concerns me. If I recreate the image as a motor, will it harm one of the other applications of the image? All these applications involve non-English wikis, but three are in French. Would you be willing to verify that the ambiguous image should be a battery/motor in all four wikis that use this image?

Also, the proper resolution of this problem is to create two svg files, one for the motor and one for the generator. I am overwhelmed with my courses this Spring, but might be able to do this during summer vacation. @Jer S: If you are interested in doing this, I will "showcase" it as an international contribution to wikimedia.

All 4 are motor-mode : 3 on fr:wiki, 1 on hi:wiki (en:linear motor from the inter-wikis, so motor-mode as well). I agree with you : should be 2 svg pictures, and I will replace it with the 2nd one (motor mode) in the wiki:fr. Please tell me when you make it, as soon as possible. Thanks and Regards, Jack ma (talk) 07:44, 15 February 2017 (UTC)