The law J = ?E, where J is current density, ? is electrical conductivity and E i

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Question
The law J = ?E, where J is current density, ? is electrical conductivity and E is field strength is
Options
A. Ohm's law
B. Gauss law
C. Ampere's law
D. Biot-Savart law

Correct Answer

Ohm's law

Explanation

It is another form of Ohm's law.

Materials and Components problems

Search Results

1. Assertion (A): For a solenoid having N turns, .
Reason (R): For all magnetic materials, B increases linearly with I.
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

2. The core of a coil has a length of 10 cm. The self inductance is 8 mH. If the core length is doubled, all other quantities remaining the same, the self inductance will be
Options
A. 32 mH
B. 16 mH
C. 8 mH
D. 4 mH

3. In metals the valence electron wave functions are strongly perturbed by the presence of neighbouring atoms.
Options
A. True
B. False

4. Assertion (A): For Diamond, ?_r = 1
Reason (R): Diamond is a diamagnetic material.
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. If a piece of wood is placed in a magnetic field
Options
A. the magnetic field will not be affected
B. the magnetic lines of force will bend towards the piece
C. the magnetic lines of force will bend away from the piece
D. the flux may increase or decrease

6. If ?_r' and ?_r" are the real and imaginary parts of complex dielectric constant ?_r, and ? is the loss angle. Then
Options
A.
B.
C. tan ? = ?'?"
D. tan ? = 1 - ?'

8. Assertion (A): Silicon is less sensitive to changes in temperature than germanium.
Reason (R): Cut in voltage in silicon is less than that in germanium.
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

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