, The resistivity of pure germanium at a particular temperature is, Mobilities of electrons and holes for an intrinsic silicon is, What is the conductivity of a semiconductor sample having electron concentration of, Determine the conductivity and resistivity of pure germanium at, Mobilities of electorns and holes in a sample of intrinsic germanium at room temperature are, A semiconductor is known to have an electron concentration of, Find the current flowing through a copper wire of length 0.2m, area of cross-section, A sample of germanium is doped to the extent of, Find the number density of impurity atoms that must be added to a pure silicon crystal inorder to convert it to have resistivity (i), Mobility of electron and holes in a sample of intristic germanium at room temperature are, The number density of electrons and holes in intrinsic silicon at a given temperature is, The number density of electron in copper is, An intrinsic semiconductor has a resistivity of 0.50, A semiconductor has an electron concentration of, NEET 2020 Correction Window Re-opened till September 30. , hence Over relatively small temperature changes (about 100ºC or less), resistivity ρ varies with temperature change ΔT as expressed in the following equation. A long, straight, copper wire with a circular cross-scctional area of 2.1 $\mathrm{mm}^{2}$ carries a current of 16 $\mathrm{A}$ . (a) To what temperature must you raise a copper wire, originally at 20.0ºC, to double its resistance, neglecting any changes in dimensions?

For a cylinder we know R = ρL/A, and so, if L and A do not change greatly with temperature, R will have the same temperature dependence as ρ.

Calculate the required vector electric field. (a) What is the resistance of this rod? The materials listed in the table are separated into categories of conductors, semiconductors, and insulators, based on broad groupings of resistivities. Solving for the diameter D, and substituting the value found for A, gives. Conversely, the resistivity of conductors increases with increasing temperature.

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(Such a rod may be used to make nuclear-particle detectors, for example.). Delhi HC instructs school to provide devices and internet to poor students for online classes, saying not doing so can lead to ‘Digital Apartheid’ or ‘Digital Discrimination’.

(c) What is the induced current in the bar when the terminal speed has been reached? ,


(Hint: Resistance can’t become negative.). We just found the resistance and party so this is equal to about 6.28 stamps, and this is also to the right, since it's gonna be in the same direction as the electric field.
Discuss why and whether this is the case here. What is a patient’s temperature if the thermistor’s resistance at that temperature is 82.0% of its value at 37.0ºC (normal body temperature)?

13.
If the filament is a cylinder 4.00 cm long (it may be coiled to save space), what is its diameter? Then its diameter can be found by assuming it has a circular cross-section.

Potential difference is equal to the electric field times the distance which in this case, is just the length of the wire. Note also that α is negative for the semiconductors listed in Table 2, meaning that their resistivity decreases with increasing temperature. So pi times diameter over two squared. Change its resistivity, length, and area to see how they affect the wire’s resistance. The direction of the field then reverses in a time interval $\Delta t$ . What is the resistance of a 20.0-m-long piece of 12-gauge copper wire having a 2.053-mm diameter? The resistivity of pure germanium under standard conditions is about_____?

A second long wire carries current 50.0 $\mathrm{A}$ to the right along the line $(y=0.280 \mathrm{m}, z=0) .$ (a) Where in the plane of the two wires is the total magnetic field equal to zero? You may assume a thermal expansion coefficient of 12 × 10−6/ºC. Expressions and Identities, Direct The electric field varies sinusoidally with time according t… (Examination of the coefficients of linear expansion shows them to be about two orders of magnitude less than typical temperature coefficients of resistivity, and so the effect of temperature on L and A is about two orders of magnitude less than on ρ.) The resistivity of a semiconductor can be modified by adding different amounts of impurities. Try it now. atoms of phosphorous (i.e., donor atoms of valence five) are added per m^(3), the semiconductor becomes n-type semiconductor.

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