MEDIUMApply to Amrita Vishwa Vidyapeetham Allied & Life Science 2024
Search Colleges, Exams, Schools & more
Electric Conductivity - Practice Questions & MCQ
Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET
Quick Facts
-
Electric Conductivity is considered one the most difficult concept.
-
33 Questions around this concept.
Solve by difficulty
In presence of interspace charge, at plate voltage of , the current is
. Then the current in mA at
will be
Following is the relation between current and charge , then value of
will be
In a triode valve the amplification factor is and mutual conductance is
. The plate resistance is
If in a triode valve amplification factor is and plate resistance is
, then its mutual conductance is
If , then on increasing plate voltage by
, how much the grid voltage is changed so that plate current remains the same
The value of current in a triode valve is given by . When plate potential and grid potential are
and
respectively, then the value of mutual conductance will be
The amplification factor of a triode valve is . If the grid voltage is changed by
volt the change in plate voltage in order to keep the plate current constant (in volt) is
In the grid circuit of a triode a signal cos ωt is applied. If
and
then root mean square current flowing through
will be
For a thermionic emitter (metallic) if represents the current density and
is its absolute temperature then the correct curve between
is
NEET Rank & College Predictor
Know your expected NEET rank and admission chances in Medical, Dental & AYUSH colleges with NEET score/rank.
Try NowIn a triode amplifier, and load resistance
. If the input signal voltage is
, then output signal voltage will be
Concepts Covered - 1
Electric Conductivity
Electrical Conductivity (σ)-
The semiconductor conducts electricity with the help of these two types of electricity or charge carriers (i.e electrons and holes).
These holes and electrons move in the opposite direction. The electrons always tend to move in opposite direction to the applied electric field.
Let the mobility of the hole in the crystal is μh and the mobility of electron in the same crystal is μe
The current density due to drift of holes is given by,
And The current density due to the drift of electrons is given by,
hence resultant current density would be
So, the general equation for conductivity is given as
where
For intrinsic semiconductors (no impurities)-
As the number of electrons will be equal to the number of holes.
i.e
Study it with Videos
Electric Conductivity"Stay in the loop. Receive exam news, study resources, and expert advice!"
Get Answer to all your questions
NEET Articles
May 17, 2024
Download Careers360 App's
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile
300M+
Students
36,000+
Colleges
550+
Exams
1500+
E-Books
16000+
Certifications
We Appeared in
Back to top