One cheat sheet will be provided
1 . The potential difference between 2 plates separated by 9 cm. Is 6 volt. Assuming a constant field between the plates, find this field in units of volt/m.
2 . The following are 2 graphs of the power - P vs. I2 for 2 devices.
Device I - (linear graph)
Device II - (nonlinear graph)
a ) Which of these devices is ohmic? b ) What is the resistance of the ohmic device? (give your answer in ohm)
3 . Find an expression for the time constant t, for the following circuits:
a) Three capacitors in series
b) (2 in series) in parallel w/ (2 in series)
c) Three in parallel
4 . A wire of total length L and resistance R , is coiled with diameter D. If the potential difference between its ends is V , what is the field inside the coil? (Find an expression in L,R,D,V and constants).
5 . The following is a graph of 2 phases generated by an AC generator,
a ) What is the phase difference between them?
b ) What is the maximum voltage?
c ) How much energy would be dissipated in one cycle through a 1 ohm
resistor if it was connected to one of the phases?
6 . Find the critical angle for the surface glass - air. (nglass = 1.5 , nair = 1). For this angle of incidence find the reflected angle.
7 . Complete the following ray diagram and find q (the distance to the image). Note - the drawing is to scale.
9 . A light wave passes through 2 polarizes with their axis of polarization at 45 degrees to one another. If the direction of the initial waves’ electric field is at 90 degrees with respect to the last polarizer, what is the ratio between the initial and the final intensities?
10 . The following is a graph of the energy of a photon emitted when some atom makes a transition from the ni = n to the nf = 2 state vs. 1/n2. What is the ionization energy? (The energy required to move the electron from the n = 1 state to outside the atom - n = ¥).
The
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