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Question 36552

posted 1 years ago

A dipole and a solid sphere of charge +Q are oriented as shown in Figure. The dipole consists of two charges q and - q, held apart by a rod of length s. The center of the dipole and the sphere are at a distance d from the location A. q = 6 nC, s =4 mm, d = 14 cm, and Q = 8 nC.
\text { Find the magnitude of the electric field }\left|\overrightarrow{\mathbf{E}}_{\text {dipole }}\right| \text { due to the dipole at the location } \mathbf{A} .
(10 points) Draw the direction of the electric field due to the dipole at the location A and write the electric field as a vector Edipole·
\text { Find the electric field vector } \overrightarrow{\mathbf{E}}_{\text {Solid sphere }} \text { due to the solid sphere at the location } \mathbf{A} \text {. }
\text { 5) Find the net electric field vector } \overrightarrow{\mathbf{E}}_{\text {net }} \text { at location } \mathbf{A} \text { due to dipole and the solid sphere. }
\text { ) If a proton is placed at location } A, \text { what would be the net electric force vector } \vec{F}_{\text {net }} \text { on the proton? }

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Question 36554

posted 1 years ago

An electric dipole is placed close to a plastic block as shown.
a. (5 points) Draw the charge polarization on the plastic block due to the electric dipole. (5 points) Explain your answer?
b. (5 points) Which of the arrows (a-j) best indicates the direction of the net electric(plastic block and electric dipole) field at location B?

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Question 36555

posted 1 years ago

The figure shows a neutral metal, placed near two point charges. The point charges polarize the metal.
Draw the approximate charge distributions on the metal due to the polarization.
(9 points) At location A, draw and label the following electric fields: E1, due to charge g,, E, due to charge q2 , and Epol due to the polarization charge on the metal?
What will be the net electric field at A due to all charges?
\text { If } \overrightarrow{\mathrm{E}}_{1}+\overrightarrow{\mathrm{E}}_{2}=\left\langle-18 \times 10^{4}, 0,0\right\rangle \mathrm{N} / \mathrm{C}, \text { calculate } \overrightarrow{\mathrm{E}}_{\mathrm{pol}}

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Question 36553

posted 1 years ago

(5 points) Two positive charges Q1and Q2 are separated by a distance r. The charges repel each other with a force of magnitude F = 16 N. If the magnitude of each charge is doubled and the distance stays unchanged, what is the new force between the charges?
b. (5 points) Draw the direction of the electric field at location C, due to the dipole?

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Question 31789

posted 1 years ago

1) Answer the following questions concisely.
a) Explain the meaning of 'unit cell'. What is the dimension of a unit cellin single crystalline silicon?
b) Using a two-dimensional sketch of the silicon crystal explain the formation of charge carriers in pure silicon and how they move in an electrical field.
c) State at least two effects that impact the conductivity of a semiconductor.

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Question 31793

posted 1 years ago

5) Pure silicon (5.0 · 1028 atoms m3) is doped with one atom in 107 of arsenic.
a) Will the material be n-type or p-type and why?
c) Calculate the conductivity of both the doped and the intrinsic material.
b) What will be the concentration of electrons and holes in the doped material?

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Question 31790

posted 1 years ago

2) When light of wavelength 311 nm is shone onto the surface of a particular metal in a vacuum, it is found that a reverse voltage (stopping potential) of 0.6 Vis needed to prevent current flow between the photoemitter and an anode connected externally to it.
Calculate the work function of the metal in electron volts(ev) and the most likely energy level (i.e. which orbit) the electrons were ejected from.

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Question 31791

posted 1 years ago

3) A hydrogen atom is ionised in a two-photon process whereby the first photon raises the electron from the ground state to the n = 3state, and the second photon ejects the n = 3 electron from the atom with a velocity of 4.15 ·105 m/s.
Calculate the frequencies and wavelengths of the two photons involved.

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Question 31794

posted 1 years ago

6) A 400 Ohm resistor is to be made from a bar shaped piece of n-type Si. The bar has a cross-section area of 10-2 cm2 and a length of 1 cm.Calculate the dopant concentration required.

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Question 31792

posted 1 years ago

4) When a sample of a pure semiconductor is exposed to light, it is found that its resistance falls when the wavelength of the light is below 500 nm.Explain this observation and deduce the bandgap of the semiconductor in eV.

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