Magnetic Field

[LadiesMan]

1. If you were to use the earth's magnetic field instead of a coil, how much current would be needed in the loop for this apparatus to work? (The vertical component of the Earth's magnetic field in our area is about 5 x 10^-5 N/A.m, while the horizontal component is about 1.5x10^-5 N/A.m) Which direction should your coil be facing?

Note I live in Toronto, Canada. The apparatus set up was using a coil and loop each with a variable power supply. We had to alter the current to balance the loop.



2. B = F(loop)/I(loop) x L



3. I'm unable to understand why I would use either horizontal component nor vertical component.

THanks

[LadiesMan]

also what are 3 possible sources of errors?

I have the earth's magnetic field but I can't figure other without listing human errors

thanks