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saveliy_v [14]
3 years ago
7

field lines point out from all sides on a object. Some of the lines point into a second object nearby. Which statement best desc

ribes the objects? A. both objects are permanent magnets B. both objects are electromagnets C. the first object is negatively charged, and the second object is positively charged D. the first object is positively charged, and the second object is negatively charged
Physics
1 answer:
Klio2033 [76]3 years ago
4 0

Answer:

The first object is positively charged, and the second object is negatively charged. (D)

Explanation:

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The current flowing in silicon bar is 2.02 \times 10^-12 A.

<u>Explanation:</u>

Length of silicon bar, l = 10 μm = 0.001 cm

Free electron density, Ne = 104 cm^3

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μn = 1200 cm^2 / V s

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The total current flowing in the bar is the sum of the drift current due to the hole and the electrons.

J = Je + Jh

J = n qE μn + p qE μp

where, n and p are electron and hole densities.

J = Eq (n μn + p μp)

we know that E = V / l

So, J = (V / l) q (n μn + p μp)

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or

J = 1.01 \times 10^-9 A / m^2

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I = 1.01 \times 10^-9 \times 0.002 = 2.02 \times 10^-12

So, the current flowing in silicon bar is 2.02 \times 10^-12 A.  

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