19.ALin?Consider two current-carrying loops on thexy-plane as shown. Loop 1 is in a magnetic field along theˆı, while Loop 2 is in a magnetic field alongˆk.Which ofthe following statements is/areTRUE?I. The torque in Loop 1 is at its maximum value.II. The potential energy for Loop 2 is at its minimum.III. Loop 2 is in an unstable equilibrium.A. I onlyB. II onlyC. I and III onlyD. II and III only20.Wire-in-a-wire-in-a-wire.Consider the cross section of three insulated coaxial wires withthe indicated currents as shown. What is the relationship of the magnetic fieldmagnitudesat points X, Y, and Z?A – 7
Final ExamFirst Semester, AY 2015–2016Physics 72For the next two items, consider a circular conductor with radiusRplaced between two in-finitely long, parallel conductors, as shown. Each conductor carries a currentIin the indicateddirections.21.101.What is the net magnetic field at the center of the circular conductor?22.One-on-One.If the circular conductor is removed, what is the magnitude of the force perunit length experienced by the left straight conductor due to the right straight conductor?23.Field.A copper wire with length0.50 mmoves perpendicularly through a0.60-Tmagneticfield at a speed of2.0m/s. What is the motional emf?A.1.20 VB.0.60 VC.0.30 VD.0.15 VA – 8
Final ExamFirst Semester, AY 2015–2016Physics 7224.Induced emf.A circular wire loop of radius2.0 mhas its plane oriented perpendicular toa spatially uniform magnetic field that is changing at a constant rate of2.0T/s. What is themagnitude of the induced emf in the loop?25.Lenzones.A square loop with side lengthsis partially im-mersed in a magnetic fieldBpointing into the page as shown,with only half of it in the region with the magnetic field. Inwhich direction should the loop move so that there is aclock-wisecurrent induced in the loop ?26.Half-half.A fully-charged capacitor withC= 25 mFis connected in series to a10-Hinductor. After how many seconds does the energy from the capacitor transfer completelyto the inductor? Assume that the resistance in the circuit is negligible.27.ULIT.What is the energy stored in a10-mHinductor connected to a circuit with a steadycurrent of0.2 A?A.400μJB.40μJC.20μJD.200μJ28.Crude Audio Filter.An AC signal consists of a superposition of frequencies200 Hz,800 Hz, and1200 Hz. Each frequency component has the same voltage amplitude1 V. Thesignal is then fed to a capacitorC= 10μF. Which of the following statements regardingthe system isTRUE?
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Physics, Magnetic Field, LRC, College of Science, πme