Question
Establish an expression for mobility by giving definition of mobility. Establish relation between mobility of free electrons and electric current.

Answer

SELF

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

Similar questions

A person standing on a platform finds that a train moving with velocity 0.6c takes one second to pass by him. Find:
  1. The length of the train as seen by the person and.
  2. The rest length of the train.
A person standing on a road sends a sound signal to the driver of a car going away from him at a speed of 72km/h. The signal travelling at 330m/s in air and having a frequencyof 1600Hz gets reflected d from the body of the car and returns. Find the frequency of the reflected signal as heard by the person.
The electrostatic force on a small sphere of charge 0.4 μC due to another small sphere of charge –0.8 μC in air is 0.2 N.
  1. What is the distance between the two spheres?
  2. What is the force on the second sphere due to the first?
A semicircular wire has a length L and mass M.A particle of mass m is placed at the centre of the circle. Find the gravitational attraction on the particle due to the wire.
In a hydrogen atom, the electron and proton are bound at a distance of about 0.53 $\mathring{\text{A}}$:
  1. Estimate the potential energy of the system in eV, taking the zero of the potential energy at infinite separation of the electron from proton.
  2. What is the minimum work required to free the electron, given that its kinetic energy in the orbit is half the magnitude of potential energy obtained in (a)?
  3. What are the answers to (a) and (b) above if the zero of potential energy is taken at 1.06 Å separation?
The index of refraction of fused quartz is 1.472 for light of wavelength 400nm and is 1.452 for light of wavelength 760nm. Find the speeds of light of these wavelengths in fused quartz.
  1. Write the expression for the force $ \overrightarrow{\text{F}}$ acting on a particle of mass m and charge q moving with velocity $ \overrightarrow{\text{V}} $ in a magnetic field $ \overrightarrow{\text{B}}$ Under what conditions will it move in (i) a circular path and (ii) a helical path?
  2. Show that the kinetic energy of the particle moving in a magnetic field remains constant.
Write the S.I. unit and dimensional formula for the permittivity of free space ?
A 40cm wire having a mass of 3.2g is stretched between two fixed supports 40.05cm apart. In its fundamental mode, the wire vibrates at 220Hz. If the area of cross-section of the wire is 1.0mm2, find its Young's modulus.
A spacecraft consumes more fuel in going from the earth to the moon than it takes for a return trip. Comment on this statement.