Find out the resistivity of a conductor in which a current density `2.5 xx 10^6 A m^-2` is found to exist, when an electric field of 15 V m^-1` is applied on it.

Define the term current density of a metallic conductor. Deduce the relation connecting current density and conductivity of the conductor when electric field E, is applied to it.

A straight conductor carries a current of 1.5 A and is 2 m long. Find the force on it, when it is parallel to a uniform field of 2xx10^-2T

A straight conductor carries a current of 1.5 A and is 2 m long. is placed in a uniform magnetic field of 0.15 T Find the force on it, when it is perpendicular.

A straight conductor carries a current of 1.5 A and is 2 m long, is placed in a uniform magnetic field of 0.15 T. Find the force on it, when it is inclined at an angle at 30^@

A current of 1 A flows through a wire of length 0.24m and area of cross-section 1.2mm^2 , when it is conneted to a battery of 3V. Find the number density of free electrons in the wire, if the electron mobility is 4.8 xx 10^-6 m^2 V^-1s^-1 , given that charge on electron = 1.6 xx 10^-19C

Calculate the resistance of an electric bulb which allows a 10 A current when connected to a 220 V power sources?

The number density of free electrons in a copper conductor estimated in Example 3.1 is 8.5 xx 10^28 m^-3 . How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 xx 10^-6 m^2 and it is carrying a current of 3.0 A.

Find the time takenby a particle of mass 2xx10^-18 andcarrying a charge 1.6xx10^-19 C to fall through adistance of 4.0m in a uniform electric field of intensity 1.6x10^3 NC^-1 .

A distance of 2 m separates two point charges of +5 xx 10^-19C . Find the point on the line joining them at which electric field intensity is zero.