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IGCSE physics easy question

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holtadit:
Look at question 9 (c) of the attached paper.

How do they get I^2 R and what formula are they referring to. ?

holtadit:
HELP!

holtadit:
Also question 9 c ii of the attached paper .

THIS A DIFFERENT QUESTION FROM THE ONE ABOVE

How do u know in which way the flexible wire moves ? I applied flemings left hand rule but i dont know in which way the index finger points... where is the North and South poles ?

astarmathsandphysics:
Half am hour

holtadit:
finally someone decides to help  :)

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