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a=12cm, b= 16cm

The current in a long straight wire is given by [itex] i = (4.5 A/s^2)t^2 - (10A/s)t [/itex]. Find the emf in the square loop at t=3.0s

now i was wondering how one would go about caluclating hte B in the square loop.

Would i use the biot savart law or Ampere's law?

I have a feeling it is ampere's law so that

[tex] \oint B \bullet ds = \mu_{0} i [/tex]

but then what is ds? The amperian loop in thsi case would be a cylinder that encompasses the whole square and more...

Please help on this

thank you for the help

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# Homework Help: Magnetic Field

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