The ratio of current density and electric field is called (A) resistivity (B) conductivity (C) Drift velocity (D) Mobility

The ratio of magnitude of current density and magnitude of electric field inside the conductor is

If vec(j) and vec(E ) are current density and electric field respectively inside a current carrying conductor , then correct relation is

The electric intesity E, current density j and conductivity sigma are related as:

Electric field (E) and current density (J) have relation

a. A steady current flows in a metallic conductor of non - uniform cross section. State which of the quantities i.e., current density, electric field, and drift velocity remain constant? b. A steady current passes through a cylindrical conductor. Is there an electorn field inside the conductor?

If n,e,A and v_(d) are free electron density inside conductor , charge of electron , area of cross-section of conductor and drift velocity of free electrons inside conductor, then current l through the conductor is

(A) : The electron passing parallel to both magnetic and electric field is always deflected from its path (R) : If velocity of electrons is equal to ratio of magnetic and electric field in crossed fields applied then electron beam remains undeflected.

A : When a steady current flows through a conductor of non - uniform cross-section , the current density , electric field and drift velcoity do not remain constant. R : For a constant current the current density electric field and drift velocity are inversely proportional to cross - sectional area.

The current density in a wire is 10A//cm^(2) and the electric field in the wire is 5 V/cm. If p = resistivity of material, sigma = conductivity of the material then (in SI unit)

Derive the expression for the current density of a conductor in terms of the conductivity and applied electic field. Explain with reason how the mobility of electrons in a conductor changes when the potential difference applied is doubled, keeping the temperature of the conductor constant.