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III. The impedance of the circuit is independent of the frequency of the signal.A. I onlyB. II onlyC. I and II onlyD. II and III onlyE.Solution:Impedance of circuit is inversely proportional to frequency, so I and III areincorrect.29.Riding the LRC.What is the impedance of a series LRC circuit with zero inductance,capacitanceC=512nF, resistanceR= 900 Ω, and angular frequencyω= 2×106rad/s?30.Pairwise.Which of the following pairs of phasor diagrams correctly illlustrates the currentand voltage across a given circuit element?
Final ExamFirst Semester, AY 2015–2016Physics 7231.EMposible.Which of the following statements is/areALWAYS TRUE?I. A time-varying electric field can be a source of magnetic fields.II. A time-varying magnetic field can be a source of electric fields.III. An electromagnetic wave can be produced by an accelerating charge.32.EMplication.Which of the following statements isFALSE?A. The net magnetic flux through any closed surface is always zero.B. In an EM wave, the electric field and magnetic field are always perpendicular toeach other.C. The direction of propagation of an EM wave is always perpendicular to the mag-netic field.D. The higher the frequency of an EM wave, the longer its wavelength.E.Solution:All statements are direct consequences of the Maxwell’s equations.33.Beatipul!As white light strikes an air-glass interface, green light (λ= 530 nm) is re-fracted, as shown.Which of the following rays best depicts the trajectory of red light(λ= 650 nm)?
Final ExamFirst Semester, AY 2015–2016Physics 7234.Pol-pol.Unpolarized light of intensityI0is incident on two consecutive polarizers whoseaxes are60◦with respect to each other. What is the final intensity of the transmitted light?35.Salamat, Snell.Light, starting from air, is incident ona slab of glass at an angle of45◦from the normal. Thetransmitted light forms an angle of60◦from theinter-face. What is the index of refraction of the glass?
Final ExamFirst Semester, AY 2015–2016Physics 72For the next three items, consider a thin lens and snow globe aligned along the same opticalaxis as shown below (grid interval is5 cm). Elsa is15 cmin front of the converging lens, whosefocal length has a magnitude of10 cm. The spherical snow globe, whose radius is10 cm, isplaced20 cmbehind the lens.