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21.101.What is the net magnetic field at the center of the circular conductor?A.μ0I2R, out of the pageB.μ0I2R, into the pageC.μ0I2R-μ0I2πR, out of the pageD.μ0I2R-μ0I2πR, into the pageE.A – 10
Final ExamFirst Semester, AY 2015–2016Physics 72Solution:μ0I2πR-μ0I2R+μ0I2πR22.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?28πRB.μ0I24πRC.μ0I22πRD.μ0I223.Field.A copper wire with length0.50 mmoves perpendicularly through a0.60-Tmagneticfield at a speed of2.0m/s. What is the motional emf?24.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?A – 11
Final ExamFirst Semester, AY 2015–2016Physics 7225.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 ?A. upB. leftC. rightD. downE.Solution:Left and right both have change in flux and would therefore induce current,but right would have decrease in flux pointing into the page. For this case, clockwisecurrent would be induced to oppose the decrease in flux. Up and down both have nochange in flux and would consequently have zero induced current.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?28.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. TheA – 12
Final ExamFirst Semester, AY 2015–2016Physics 72signal is then fed to a capacitorC= 10μF. Which of the following statements regardingthe system isTRUE?I. The200 Hzsignal will cause thelargestpeak current through the capacitor.II. The average power dissipated by the capacitor is zero.