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# Need help ! watch

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1. Go to Question 5)B)
Whats the answer there guys ?
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2. January 2007 Phy5.pdf (263.8 KB, 60 views)
3. Switch closed => current flows through foil.

Current => magnetic field => force.

Foil will therefore feel a force and will move (if it is not secured) or deform (if it is secured)

Direction of movement can be found using lorentz force law, or right hand rule... in this case it is to the right.
Switch closed => current flows through foil.

Current => magnetic field => force.

Foil will therefore feel a force and will move (if it is not secured) or deform (if it is secured)

Direction of movement can be found using lorentz force law, or right hand rule... in this case it is to the right.
I agree,but the mark scheme says:
Current down the page
(Resultant) magnetic field is into the page
"Fleming's Left hand rule'
Foil moves to the right
Switch closed => current flows through foil.

Current => magnetic field => force.

Foil will therefore feel a force and will move (if it is not secured) or deform (if it is secured)

Direction of movement can be found using lorentz force law, or right hand rule... in this case it is to the right.

Agreed.
6. Convential current from + to - ok i found my mistake
7. Convential current from + to - ok i found my mistake
The Left hand rule has definition of conventional current built into it... I prefer not to use it for this reason, as it can be confusing if you forget this! Much simpler to always figure out the direction in which the electrons are flowing and use the Right hand rule, as this is more definitive...

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