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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 6
41.
M = (μr - 1)H.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
42.
Silicon and germanium are elements in the
second column of periodic table
third column of periodic table
fourth column of periodic table
fifth column of periodic table
Answer: Option
Explanation:
No answer description is available. Let's discuss.
43.
A sample of N type semiconductor has an electron density of 6.25 x 1018/cm3 at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 1013/cm3 at this temperature, the hole density is
106 / cm3
108 / cm3
1010 / cm3
1012 / cm3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
44.

Assertion (A): In a conductor, current density remains constant in time as long as E is constant.

Reason (R): In a conductor, J = σE.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

In conductors constant E means constant current because conductivity is constant.

45.
A specimen of metal has n valence electrons per m3. If vx is the average velocity of these electrons, each having a charge e, the current density J is
J = ne vx
J = - ne vx
J =
J =
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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