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CBSE Class-12 Physics Chapter-03

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Questions and Answers

What is the SI unit of conductivity?

$rac{ ext{ohm}}{m}$
S/m (correct)
$rac{m}{ ext{ohm}}$
mS/m

What does the current density vector J represent?

Magnitude of drift velocity per unit electric field
Current per unit area flowing through area (correct)
Number density of charge carriers
Net charge passing per unit time through the area

What is the formula for resistivity?

$\rho = \frac{1}{I}$
$\rho = \frac{1}{\sigma}$ (correct)
$\rho = \frac{1}{J}$
$\rho = \frac{1}{\tau}$

What is the formula for mobility?

<p>$rac{V_d}{E}$ (C)</p> Signup and view all the answers

What is the formula for current through a given area of a conductor?

<p>$I = neV_dA$ (C)</p> Signup and view all the answers

Flashcards

SI unit of conductivity

The standard unit for measuring conductivity is S/m.

Current density vector J

Represents the current per unit area flowing through a surface.

Formula for resistivity

Resistivity is calculated as the inverse of conductivity: ρ = 1/σ.

Formula for mobility

Mobility (μ) is the ratio of drift velocity (V_d) to electric field (E): μ = V_d/E.

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Formula for current in a conductor

The current (I) can be found using I = neV_dA, where n is charge density, e is charge per carrier, and V_d is drift velocity.