RH rule for electron

[kenhung123]

For this question I get the force as down the page because the thumb is pointing to the left (electron travels opposite direction to current?), fingers pointing into the page...did I do something wrong? What do you reckon the answer is?

[Whatlol]

For this question I get the force as down the page because the thumb is pointing to the left (electron travels opposite direction to current?), fingers pointing into the page...did I do something wrong? What do you reckon the answer is?

The thumb is supposed to point in the direction of the current, so to the right and your fingers will point downwards or into the page, so the force will be north or up

[cameron_15]

Conventional current is the flow of positive charge, so yes, when you have electrons moving in one direction, it has the same effect as a positive charge moving in the opposite direction.

If I is conventional (ie electrons flowing left...) then the thumb point right, fingers point into page and the force is up the page...

[kenhung123]

Yea but umm the question  asks for the force on the electron, does it mean we take the direction of the charge (electron) as opposite to that of current?

[kenhung123]

Conventional current is the flow of positive charge, so yes, when you have electrons moving in one direction, it has the same effect as a positive charge moving in the opposite direction.

If I is conventional (ie electrons flowing left...) then the thumb point right, fingers point into page and the force is up the page...

Oh, so when do I actually need to reverse my thumb for negative charges?

[kakar0t]

Yea but umm the question  asks for the force on the electron, does it mean we take the direction of the charge (electron) as opposite to that of current?

The right hand rule is for positive ions (so protons)

For electrons, you just have to take the opposite direction of the force you get from the right hand rule

So if you get DOWN force from RH rule, that is the force on a POSITIVE ion
All you have to do to get the force for the NEGATIVE ion (electron) is to reverse the direction you got

Note: the RH rule is applied in the same way, the force just assumes reverse direction for electrons (palm facing down -> force goes up)

[Whatlol]

Yea but umm the question  asks for the force on the electron, does it mean we take the direction of the charge (electron) as opposite to that of current?

The right hand rule is for positive ions (so protons)

For electrons, you just have to take the opposite direction of the force you get from the right hand rule

So if you get DOWN force from RH rule, that is the force on a POSITIVE ion
All you have to do to get the force for the NEGATIVE ion (electron) is to reverse the direction you got

Note: the RH rule is applied in the same way, the force just assumes reverse direction for electrons (palm facing down -> force goes up)

or alternatively just identify that the current will be flowing in the opposite direction as the electrons motion and apply the RHS rule.

[kenhung123]

So in this case should the force be down for the electron?

[TrueTears]

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.

[Whatlol]

So in this case should the force be down for the electron?

Im getting an upwards force

[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)

[kenhung123]

So in this case should the force be down for the electron?

Im getting an upwards force

Fingers in (field in page), thumb to the left (opposite current?)

[Whatlol]

So in this case should the force be down for the electron?

Im getting an upwards force

Fingers in (field in page), thumb to the left (opposite current?)

Your fingers are fine but the thumb is always in the direction of the current. so to the right.

[TrueTears]

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

[kenhung123]

So in this case should the force be down for the electron?

Im getting an upwards force

Fingers in (field in page), thumb to the left (opposite current?)

Your fingers are fine but the thumb is always in the direction of the current. so to the right.

Ahh sorry if I am confused...but this is electron yea? So why not in opposite (the left)? O.o