PHYS 208 Midterm: PHYS 208 TAMU Exam 3 2008
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1. (25 points) an infinitely long wire carrying a current i has a circular cross section of radius w. the current is uniformly spread over the cross sectional area. If the center of the wire is at the origin, find the points on the x axis where the magnetic field has one half the magnitude of the magnetic field at the surface of the wire. 2/ tin: j(25 points)a circular loop of very thin wire has radius r and carries a current i. 3. (25 points)in the circuit below the capacitor is originally charged with qo on the top plate and qo on the bottom. At t = u the switch is closed: find the charge on the plates as a function of time assuming the self inductance of the circuit can be ignored. Please note that all wires in this circuit have no resistance: in the circuit below the capacitor is initially uncharged.
