Investigate how the force on a wire varies with magnetic flux density, current and legnth of wire using a top pan balnce Flashcards
1
Q
top pan balnce
A
- sensitive to measure the small force on wire
2
Q
experimental arrangement
A
- magnets poles on the faces fixed to stell yoke, creating a uniform field
- check magnets attact to ensure north face south
- wire supported horizontally, perpendicular to field lines
3
Q
procedure
A
- balance zeroed current switch on
- current and balance reading record
- current increased, reading taken for at least six sets
- alternative length of wire can be doublled
4
Q
safety
A
- large currents needed for measureable forces
- causes wire to heat up
- switch off ebtween used
5
Q
how is current altered
A
variable resistor
6
Q
graph
A
F against I
gradient is Bl
