Download App

Electric Current in Conductors — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectric Current in Conductors1 Mark
Question
The drift speed is defined as $\text{v}_\text{d}=\frac{\Delta\text{l}}{\Delta\text{t}}$ where $\Delta\text{l}$ is the distance drifted in a long time $\Delta\text{t}.$ Why don't we define the drift speed as the limit of $\frac{\Delta\text{l}}{\Delta\text{t}}\ \text{as}\ \Delta\text{t}\rightarrow0?$
✓

Answer

As electron doesn't travel linearly so we need to calculate average time thus we need to consider drift distance for long time. That can not be calculated in case of t → 0.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

State reason for the generation of displacement current.
→
Water flows through a tube shown in The areas of cross-section at A and B are $1cm^2$ and $0.5cm^2$ respectively. The height difference between A and B is 5cm. If the speed of water at A is 10cm/s find.
  1. The speed at B.
  2. The difference in pressures at A and B.
→
Which radiations do not produce photo-electric effect in metals?
→
A sample of $\ce{HCl}$ gas is placed in an electric field of $3 \times 10^4 N / C$. The dipole moment of each molecule of $\ce{HCl}$ is $6 \times 10^{-30} C \times m$. What will be the maximum torque acting on the molecule?
→
Write difference between terminal voltage and electromotive force of a cell.
→
What is the direction of induced currents in metal rings 1 and 2 when current I in the wire is increasing steadily?
→
Answer the following question:
When a low flying aircraft passes overhead, we sometimes notice a slight shaking of the picture on our TV screen. Suggest a possible explanation.
→
Define electric flux.
→
Calculate the capacitance of a parallel plate capacitor having area $A=1 m^2$ and $d=1 mm$
→
A particle starts from a point A and travels along the solid curve shown in figure. Find approximately the position B of the particle such that the average velocity between the positions A and B has the same direction as the instantaneous velocity at B.
→