A charge cloud of length L=0.1m ,charge density `rho=3C/ m` crosses a plane perpendicularly with a velocity `v=0.01m/s` .The current density is

A particle of mass m and charge q enters a magnetic field B perpendicularly with a velocity v , The radius of the circular path described by it will be

A metal cube of length 0.1 is charged by 12 mu C . Calculate its surface charge density.

At constant pressure the r.m.s. velocity c is related to density d as

A charged spherical conductor has a surface charge density of 0.7C//m^(2) .When its charge is increased by 0.44C the charge denstiy changes by 0.14C//m^(2) the radius of the sphere is

A uniformly charged sphere of radius R=2m and volume charge density rho has a spherical cavity as shown.A point object of mass m=1g and charge q=2times10^(-4)C is thrown from point A.The minimum velocity required at A for it to reach point B in meter per second is (rho=3 varepsilon_(0)times10^(-3)cm^(-3))

A stone of mass 20 g is projected from a rubber catapult of length 0.1 m and area of cross section 10^(-6)m^(2) stretched by an amount 0.04 m. The velocity of the projected stone is __________ m/s. (Young's modulus of rubber =0.5 xx 10^(9) N//m^(2) )

Find the velocity of charge leading to 1A current which flows in a copper conductor of cross section 1cm^2 and length 10 km . Free electron density of copper is 8.5x10^28//m^3 . How long will it take the electric charge to travel from one end of the conductor to the other?