請問 science 中的right hand grip rule , 如何分辨個方向係clockrise 定anticlock？thanks?

The Right Hand Grip rule serves TWO purposes. One is to find the direction of magnetic field surrounding a current in a wire. The other is to find the "direction" of the North pole in a current carrying coil.

I suppose you ask for the first purpose of using the rule. It says that if the thumb describes the direction of current, then the other fingers describe the direction of the magnetic field.

It means that if you are loonking along the direction of the electric current at the end of the wire, the mangetic field will be in the "clockwise direction". On the contrary, if you are looking at the direction against the direction of current flow, then the direction of magnetic field will be in the "anticlockwise direction".