TS EAMCET202220 Jul 2022Morning ShiftPhysicsCurrent ElectricityActual
Statement (I) : Specific resistance depends on nature of material and independent of temperature of the material. Statement (II) : A wire of resistance 6 is drawn out so that its new length is four times its original length. The resistance of the new wire is 48 . Statement (III) : Drift velocity is the average constant velocity acquired by free electrons inside a metal by the application of an electric field which re
Options
- AStatements I, II and III are true
- BStatement I is true, but statements II, III is false
- CStatement III is true, but statements I, II are false
- DStatements II, III are true, but statement I is false
Correct answer
C. Statement III is true, but statements I, II are false
Step-by-step solution
Specific resistance depends both on temperature and nature of material. So (I) is incorrect. When length becomes ' n ' time, resistance becomes n^2 times. So new resistance will be 4^2 6=96 So (II) is incorrect. Drift velocity is average velocity with which free electron get drifted in direction of electric field. So (III) is correct.