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CIE physics

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falafail:
nevermind, got it. thanks anyway. :D

there's something else i don't get though...
show an understanding of how the force on a current-carrying conductor can be used to measure the flux density of a magnetic field using a current balance  ???

astarmathsandphysics:
A hall probe is easier to use. I am looking for a simple explanation of how current balances work. I dont understand at the moment why it doesnt work the same as a dynamo

astarmathsandphysics:
http://images.google.co.uk/imgres?imgurl=http://cla.sd57.bc.ca/~rgiroday/Physics12.0809/unit7/U07L04/currentbalance1.gif&imgrefurl=http://cla.sd57.bc.ca/~rgiroday/Physics12.0809/unit7/U07L04.htm&usg=__75ckyJLYFaW03JyEISNFwrylfj0=&h=415&w=548&sz=16&hl=en&start=1&sig2=T7w9-HUDrwP9btU0IWxc5g&um=1&itbs=1&tbnid=wHIm-mKtLEKpZM:&tbnh=101&tbnw=133&prev=/images%3Fq%3Dmeasuring%2Bmagnetic%2Bfield%2Busing%2Bcurrent%2Bbalance%26um%3D1%26hl%3Den%26client%3Dsafari%26rls%3Den-gb%26tbs%3Disch:1&ei=lRHUS80GyZM4kv2x0w0


expained here

falafail:

--- Quote from: astarmathsandphysics on April 25, 2010, 10:46:50 am ---A hall probe is easier to use. I am looking for a simple explanation of how current balances work. I dont understand at the moment why it doesnt work the same as a dynamo

--- End quote ---

what's a dynamo?
and could you explain how hall probes are used as well? please & thank you.

astarmathsandphysics:
A dynamo is just a wire loop that turns in side a magnetic field and so generates a current.
A hall probe measures a magnetic field by measuring the force on a current carrying conductor in a magnetic field

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