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By an infinitely long straight wire that is in a vacuum for astationary current I. Using Ampere's law, determine the modulus of the magnetic

By an infinitely long straight wire that is in a vacuum for astationary current I. Using Ampere's law, determine the modulus of the magnetic field at a distance r from the wire and the correct value is found to be: a) Hol b) 2ar c ) 2 d) ! 2ar Ho!

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