ECAT Pakistan · Physics

Electromagnetism and Wave Optics

8 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 8 questions

  1. A copper rod of length L = 0.50 m moves at constant speed v = 4.0 m/s perpendicular to a uniform magnetic field B = 0.60 T. What motional electromotive force (EMF) is induced across its ends?
  2. In an RLC series circuit at resonance frequency f_0, what is the phase difference between the supply voltage and the circuit current?
  3. What is the resonant frequency of an LC circuit consisting of an inductor L = 2.0 mH and a capacitor C = 5.0 microfarads?
  4. Unpolarized light of intensity I_0 passes sequentially through two ideal polarizers whose transmission axes are oriented at an angle of 60 degrees to each other. What is the transmitted intensity?
  5. What is the energy stored in a 10.0 microfarad capacitor charged to a potential difference of 200 V?
  6. Which Maxwell equation expresses the empirical physical fact that magnetic monopoles do not exist in nature?
  7. What is the Brewster angle (polarizing angle) for light incident from air into glass with refractive index n = 1.732 (approx. sqrt(3))?
  8. A step-down electrical transformer operates on a 2200 V primary line and delivers power at 220 V to a 22-ohm load. Assuming an ideal 100 percent efficient transformer, what is the primary current?

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