Sketch a plot of the current I versus voltage V across an ideal photocell when visible light is incident on the cell. Note that the “amplitude” factor I0 should be assumed to be negative.
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Q: Sketch a plot of the current / versus voltage V across an ideal photocell when visible light is…
A: SOlution:
Sketch a plot of the current I versus voltage V across an ideal photocell when visible light is incident on the cell. Note that the “amplitude” factor I0 should be assumed to be negative.
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- Sketch a plot of the current / versus voltage V across an ideal photocell when visible light is incident on the cell. Note that the "amplitude" factor lo should be assumed to be negative.If one uses an electric conductor that is much thicker than the skin depth, 8, conductive material is wasted because no current flows in the interior of the Q2 (а) conductor. Let us adopt tMy = 28 as an approximate value of the maximum useful thickness. Find tMU for copper at 60 Hz, 10 MHz and 10 GHz. Conductivity for copper is o = 5.8×10’S/m. (b) An electromagnetic wave is incident normally upon a thick metallic slab. The electric field has a magnitude of 10 V/m just inside the surface. What is the electric field at a point 28 below the surface where 8 is the skin depth? (c) For skin-effect theory to apply, it is necessary for conductivity to be sufficiently high. Determine whether skin-effect theory can be applied to: (i) A sample of silicon with relative permittivity ɛ, =11.7, conductivity o = 1000 S/m at frequency f =10 GHz. [4 (ii) A sample of seawater with &, = 81, o=4 S/m at f =1 kHz. ONFor analyzing the relationship between electrode radii and electric field in an electrode system (not necessarily concentric spheres), the graph of change in Emax with respect to ri is obtained as shown in the figure. Suppose that the effective electrode separation varies as a = r,(2 – In(r,)). Considering electric field strength of Es=50 kV/cm . a) Find the range of ri to have partial discharge. b) Find the range of rị to have total breakdown. c) Sketch the graph of change in Umax With respect to r; and specify the breakdown behavior in different regions by considering U=100 kV. * 100 90 80 70 60 50 40 30 20 10 rl (cm) r2=7 Optimum Geometric Char. Emax (rl) kV/cm
- Consider a satellite in stationary orbit that beams a signal earthward with a power of 4.9 kilowatts and a beamwidth covering a circular region with diameter 193 km on Earth. What is the root-mean- square electric field strength at the receiver within the illuminated area, assuming a uniform energy distribution? Use the free space permeability lo = 1.257x10-6 H/m and the free space permittivity eo = 8.85x10-12 F/m.A capacitor with square plates, each with an area of 32.0 cm² and plate separation d = 2.48 mm, is being charged by a 255-mA current. (a) What is the change in the electric flux between the plates as a function of time? (Use the following as necessary: t. Do not use other variables, substitute numeric values. Assume that do/dt is in V m/s and t is in seconds. Do not include units in your answer. Enter the magnitude.) ΟΦΕ dt (b) What is the magnitude of the displacement current between the capacitor's plates? AIn a certain region of space there are electrons moving randomly. In any 1 µs time interval, the probability of finding an electron in a subregion of volume V=10-15 m³ is 0.27. What volumetric charge density should be assigned to that sub-region for that interval?
- In Millikan's oil-drop experiment, one looks at a small oil drop held motionless between two plates. Take the voltage between the plates to be 2340 V, and the plate separation to be 2.30 cm. The oil drop (of density 0.810 g/cm?) has a diameter of 4.15 x 10- m. Find the charge (in C) on the drop.A capacitor with square plates, each with an area of 35.0 cm2 and plate separation d = 2.46 mm, is being charged by a 455-mA current. (a) What is the change in the electric flux between the plates as a function of time? (Use the following as necessary: t. Do not use other variables, substitute numeric values. Assume that dE/dt is in V. m/s and t is in seconds. Do not include units in your answer. Enter the magnitude.) dt (b) What is the magnitude of the displacement current between the capacitor's plates? AA capacitor with square plates, each with an area of 37.0 cm² and plate separation d = 2.62 mm, is being charged by a 205-mA current. (a) What is the change in the electric flux between the plates as a function of time? (Use the following as necessary: t. Do not use other variables, substitute numeric values. Assume that doe/dt is in V m/s and t is in seconds. Do not include units in your answer. Enter the magnitude.) de dt = (b) What is the magnitude of the displacement current between the capacitor's plates?
- Assume solar flux falling on a typical panel on planet earth to be 1370 Watts per square meter with sunshine at least half of the year and roughly one quarter of the earth surface bathed in sunlight daily as the planet rotates. The best panels convert photonic energy to electrical energy at about 25 % (efficiency). Given that the world consumes around 600 exaJoules (one exaJ = 1028 J) how much area would be required to power up the world with solar arrays. (Give your answer in square kilometers please!)Compute λD and ND for the following cases: (a) A glow discharge, with n = 1016 m-3, KT, = 2 eV. (b) The earth's ionosphere, with n = 1012 m-3, KT, = 0.1 eV. (c) A ϴ-pinch, with n = 1023 rn-3, KT, = 800 eVA regular LED light bulb continuously emits 10.0 W of light uniformly in all directions. A man stands so that his eyes are 5.00 m away from this light bulb and he is looking directly at the light bulb. There are no other sources of light in this room. (a) What is the irradiance of this light in W/m2 just before entering this man's eyes? (b) If each pupil of this man is contracted to a radius of 2.00 mm, what is the total power in W of the light entering each eye? (c) A human receives 3300 J of usable energy after eating one blueberry. How long would this man have to stare at this light bulb in order to take into his eyes through the pupils the same amount of energy as eating a blueberry? Don't forget that he has two eyes! (Note that far more energy from the light is hitting his skin, but that is not what we care about here.)