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An electric current I=0.75 A is flowing in a circular wire with readius R=.035 m

a) Express the magnetic field vector B generated at the center O in terms of I, the radius vector R, and the length element vector ds.

b) What's the direction of the magnetic field at point O?

c) Express the magnitude of the magnetic field at point O, B, in terms of I, R.

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B=?0I/2?R

=4*?*10-7*0.75/2*?*0.35

=4.28*10-7T

Coming out to the paper..
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