Question:
Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because
Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because
Updated On: Apr 15, 2024
- electron number density depends on temperature
- electron number density is very large
- relaxation time is small
- drift velocity of electron is very large
Hide Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Current I =$ne AV_{d}$
The large value of I is because of number density of free electrons in a conductor (n) which is of the order n = $10^{28} \, per \,m^{3}$
Was this answer helpful?
0
0
Top Questions on Electromagnetic induction
- A wire of length \( L \) having Resistance \( R \) falls from a height \( h \) in Earth's horizontal magnetic field. What is the current through the wire?
- MHT CET - 2025
- Physics
- Electromagnetic induction
- A conducting rod of length L and mass m falls vertically under gravity through a region of uniform magnetic field B, directed into the plane of the page. The rod is placed on two smooth, vertical conducting rails connected at the bottom by a resistor R. Assuming no friction or air resistance, and the rod quickly reaches a constant terminal velocity, find the expression for v in terms of B, L, m, R.
- MHT CET - 2025
- Physics
- Electromagnetic induction
- A rectangular metallic loop is moving out of a uniform magnetic field region to a field-free region with a constant speed. When the loop is partially inside the magnetic field, the plot of the magnitude of the induced emf \( (\varepsilon) \) with time \( (t) \) is given by:
- JEE Main - 2025
- Physics
- Electromagnetic induction
- A conducting bar moves on two conducting rails as shown in the figure. A constant magnetic field \( B \) exists into the page. The bar starts to move from the vertex at time \( t = 0 \) with a constant velocity. If the induced EMF is \( E \propto t^n \), then the value of \( n \) is ________________________.
- JEE Main - 2025
- Physics
- Electromagnetic induction
- If \( B \) is magnetic field and \( \mu_0 \) is permeability of free space, then the dimensions of \( \frac{B}{\mu_0} \) is:
- JEE Main - 2025
- Physics
- Electromagnetic induction
View More Questions
Questions Asked in KCET exam
- In the following scheme of reaction.
X, Y and Z respectively are:- KCET - 2024
- Haloalkanes and Haloarenes
- The area of the region bounded by the line $y = x$ and the curve $y = x^3$ is:
- KCET - 2024
- Area between Two Curves
- The vectors $\overrightarrow{AB} = 3\hat{i} + 4\hat{k}$ and $\overrightarrow{AC} = 5\hat{i} - 2\hat{j} + 4\hat{k}$ are the sides of a $\triangle ABC$. The length of the median through $A$ is:
- KCET - 2024
- Vectors
- Three polaroid sheets are co-axially placed as indicated in the diagram. Pass axes of the polaroids 2 and 3 make 30° and 90° with pass axes of polaroid sheet 1. If \( I_1 \) is the intensity of the incident unpolarised light entering sheet 1, the intensity of the emergent light through sheet 3 is
- KCET - 2024
- Polarization
- If lines $\frac{x - 1}{-3} = \frac{y - 2}{2k} = \frac{z - 3}{2}$ and $\frac{x - 1}{3k} = \frac{y - 5}{1} = \frac{z - 6}{-5}$ are mutually perpendicular, then $k$ is equal to:
- KCET - 2024
- Straight lines
View More Questions
Concepts Used:
Electromagnetic Induction
Electromagnetic Induction is a current produced by the voltage production due to a changing magnetic field. This happens in one of the two conditions:-
- When we place the conductor in a changing magnetic field.
- When the conductor constantly moves in a stationary field.
Formula:
The electromagnetic induction is mathematically represented as:-
e=N × d∅.dt
Where
- e = induced voltage
- N = number of turns in the coil
- Φ = Magnetic flux (This is the amount of magnetic field present on the surface)
- t = time
Applications of Electromagnetic Induction
- Electromagnetic induction in AC generator
- Electrical Transformers
- Magnetic Flow Meter