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- A 12.0 µF capacitor is charged to a potential of 50.0 V and then discharged through a 175 Qresistor. How long does it take the capacitor to lose half of its charge? Select one: t%3D1.46 ms t = 5.00 ms t%3D0.87ms t%34.36ms None of these is correct Next pagQ2. Consider the general form of the frequency dependent relative permittivity of a medium: €,(w) = 1+ Etiw Ng², Tmeo (a) How does the above expression get modified if we assume that all the electrons have same natural frequency of oscillation? (b) Under the assumption made in part (a) and considering just one molecule per volume, plot the real and imaginary parts of €, as functions of frequency of the applied electric field. (c) Show that under certain assumption, the relative permittivity of a metal can be written as: e, (w) = (1– (d) What is the physical interpretation wp for a metal?The polarizability of NH3 molecule is found approximately by the measurement of dielectric constant as 2-42 x 10-39 coulomb²-m/newton and 1-74 x 10-39 coulomb?-m/newton on 309K and 448K respectively. Calculate for each temperature the polarizability due to deformation of molecules.
- 3. The potential energy of two particles in the electrostatic field when they are separated by a distance r is given by α В -- + 4/8 r 78 U = -- + where a and ẞ are constants. At what separation will they form a stable compound?A galvanic (voltaic) cell consists of an inert platinum electrode in a solution containing 1.0 M chromium(III) ion and 1.0 M chromium(II) ion, and another inert platinum electrode in a solution containing 1.0 M cerium(IV) ion and 1.0 M cerium(III) ion, connected by a salt bridge. Calculate the standard potential for this cell at 25°C. Standard reduction potentials can be found in the standard reduction potentials table. ?∘cell=Show that for V less than zero, InetI0.
- 3. For a Si bar of length 5um, doped n-type at 3x10¹ cm³, calculate the current density for an applied field of 3V across its length. Then do the same for a voltage of 3200V. You can assume that the electron and hole mobilities are 1500 and 500 cm²/V.s, respectively, in the ohmic region below 10¹V/cm and. For higher fields, both electrons and holes have a saturation velocity of 107cm/s.Soru 9 X-2x10 cm X=1x105 cm E(0)= -2x104 v/cm For given electric field of an pn junction calculate the magnitude built in potental in units of mV. Write your answer as positive integer. Yanıt: 210703141851-22397 Önceki sayfa 46 శండిడింConduc-Thor-s. Thor has two square prism conductors that are made of the same ohmic material and with properties indicated below. Conductor Length | Cross-Section Side Length Alpha L Beta L/2 s/4 Suppose both conductors are subject to the same potential difference AV across their length while keeping their temperatures fixed. Which of the following is the correct relation between the electric currents, Ia and IB, through Alpha and Beta? O A. Ia = 8IB O B. 8Ia = Ig O. Ia = 4I8 O D. 4Ig = Ig Clear my choice
- What’s the difference between electrons traveling in a semiconductor vs electrons traveling in a vacuum? please explain in terms of potentials, the type of transport, and velocities they can attain?Q. The ends of the cylinder are made of conducting discs and the space between these discs are filled with an inhomogeneous ohmic medium whose conductivity o = L/(z+1). Where L is the separation distance of the discs. A d-c voltage Vo is applied across the discs as shown on the right. Determine V. a) The total resistance between the discs b) The surface charge densities on the discs c) The volume charge density and the total amount of charge between the discsV, = 10 V Checking: V = v, + V, 5 V + 10 V %3D = 15 V Activity 3.1. Problem-Solving with Network of Capacitances Determine a. C b. q 9,, and q,; and c. V, and V, for the following network of capacitances: eq 1. C, = 10 mF and C, = 2 mF in series with 12 V = V %3D 2. C, = 4 pF and C, = 2 µF in series with 12 V = V Conceptual Science and Beyond 55