1. A straight wire of length 0.62 m carries a conventional current of 0.8 amperes. What is the magnitude of the magnetic field made by the current at a location that is a perpendicular distance 2.9 cm from the center of the wire ? Use both the exact formula and the approximate formula to calculate the field.
2. A long straight wire carries a conventional current of 0.9 amperes. What is the approximate magnitude of the magnetic field at a location a perpendicular distance of 0.035m from the wire due to the current in the wire?