English

Write Its (‘Mobility’ of Charge Carriers) S.I. Unit

Advertisements
Advertisements

Question

Write its (‘mobility’ of charge carriers) S.I. unit

Advertisements

Solution

The SI unit of μ is m2V-1s-1 or ms1N1C.

shaalaa.com
  Is there an error in this question or solution?
2014-2015 (March) Panchkula Set 3

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

Define the term drift velocity.


At room temperature, copper has free electron density of 8.4 × 1028 per m3. The copper conductor has a cross-section of l0−6 m2 and carries a current of 5.4 A. The electron drift velocity in copper is:


Metals are good conductor of heat than insulator because


An electric bulb.is rated 220 v and 100 watt power consumed by it when operated on 'no volt is:-


The relaxation time τ is nearly independent of applied E field whereas it changes significantly with temperature T. First fact is (in part) responsible for Ohm’s law whereas the second fact leads to variation of ρ with temperature. Elaborate why?


  1. Consider circuit in figure. How much energy is absorbed by electrons from the initial state of no current (ignore thermal motion) to the state of drift velocity?
  2. Electrons give up energy at the rate of RI2 per second to the thermal energy. What time scale would one associate with energy in problem (a)? n = no of electron/volume = 1029/m3, length of circuit = 10 cm, cross-section = A = (1mm)2


Derive an expression for resistivity of a conductor in terms of the number density of charge carriers in the conductor and relaxation time.


The potential difference applied across a given conductor is doubled. How will this affect (i) the mobility of electrons and (ii) the current density in the conductor? Justify your answers.


Explain how free electrons in a metal at constant temperature attain an average velocity under the action of an electric field. Hence, obtain an expression for it.


Consider two conducting wires A and B of the same diameter but made of different materials joined in series across a battery. The number density of electrons in A is 1.5 times that in B. Find the ratio of the drift velocity of electrons in wire A to that in wire B.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×