LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
in Electronics by (30.0k points)
closed by
______ has the highest mobility.
1. Ions
2. Electrons
3. Neutron
4. Proton

1 Answer

0 votes
by (54.0k points)
selected by
Best answer
Correct Answer - Option 2 : Electrons


Mobility (μ): It is defined as drift velocity per unit electric field applied i.e.,

\(\mu = \frac{{{v_d}}}{E} = \frac{{q\tau }}{m}\)

Where τ = average relaxation time, m = mass of charge particle and q = charge on a charged particle.


  • The effective mass of electrons is 9.11 × 10-31 kg.
  • Holes being present in the valence band are closer to the nuclei and experience more attractive force and hence have a higher effective mass.
  • So, the mobility of free electrons is higher than that of holes because electrons are lighter

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.