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

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Question
Assertion (A): In a conductor, current density remains constant in time as long as E is constant.
Reason (R): In a conductor, J = ?E.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

Correct Answer

Both A and R are true and R is correct explanation of A

Explanation

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

Materials and Components problems

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2. An air cored inductance is a
Options
A. linear circuit element because its reactance varies linearly with voltage at a fixed frequency
B. linear circuit element because its current varies linearly with voltage at a fixed frequency
C. nonlinear circuit element due to saturation of core
D. nonlinear circuit element because v =

3. Assertion (A): An amorphous material is obtained when mobility of atoms is inhibited during solidification.
Reason (R): Crystalline state is a natural state for most solids.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

5. When Schrodinger equation is applied to the motion of electron in the field of protons, the physically acceptable solutions for the wave function exist for quantum number which are
Options
A. 2
B. 3
C. 4
D. 5

8. Antiferromagnetic materials do not have permanent dipoles.
Options
A. True
B. False

9. Silicon and germanium are elements in the
Options
A. second column of periodic table
B. third column of periodic table
C. fourth column of periodic table
D. fifth column of periodic table

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