RH rule for electron

[kenhung123]

Ok, when you have electrons use the left hand rule, basically it's the same thing as the RH rule but just use ur left hand. So your thumb on ur left hand points in the direction of where the ELECTRONS go.

Do you mean you can use your left hand to point where the current goes because if you use your left hand to point where electron goes (opposite current) that means your doing the same thing as if you do with right hand (reverse thumb to point in direction of electron)

actually thats right, maybe u do point in the direction of the current with the left hand, i forgot maybe /0 can confirm this, i forgot most of vce physix, in uni you would use maths to determine direction not some rule using ur hand bahaha

Fair enough. Thanks anyway

[Whatlol]

If your still confused ill try explain it in a really clear way.

So you just treat this question as normal and still use your normal right hand slap rule.

The fingers will point in the direction of the magnetic field as normal, and your thumb will point in the direction of the current as normal.
In this case the only significance of having an electron is that the direction of the current will be opposite to that of the electrons motion.

As already mentioned the current is the flow of positive charges so if the electron is a negative charge it seems quite logical you can assume a positive charge flowing in the opposite direction ( just like a circuit, where you have electrons flowing but you take the current in the opposite direction).

So quite simply you just apply the normal rules, you get your right hand, position your fingers down and your thumb to the right, which is the direction of the current. Therefore the force will be in an upwards direction.

[kenhung123]

So your saying that the current they are referring to is already electrons moving to the right and thus its already given?

[Whatlol]

So your saying that the current they are referring to is already electrons moving to the right and thus its already given?

Current refers to the flow of positive charges. the electrons move in the opposite direction to the conventional current. So if you have a diagram that already has the current labeled that is the direction you point your thumb in.

[physics]

this stuff?

[kenhung123]

Oh ok, thanks guys for the help

[/0]

Your thumb points in the direction of flow of positive charge.

With wires, this can actually be pretty tricky. In a wire, it's really only the negative charges that are moving, but this is equivalent to thinking that the the positive charges are moving in the opposite direction. It's a subtle thing, but important to accept.
With conventional current (which we use in VCE), we denote the direction of current flow as being in the direction these 'imaginary' positive charges moves.

So if the conventional current is going right, that's where the 'imaginary' positive charges are moving, so you point your thumb right.