A long cylindrical wire carries a positive charge of linear density `lambda`. An electron `(-e ,m)` revolves around it in a circular path under the influence of the attractive electrostatic force. Find the speed of the electron.

A long cylindrical wire carries a positive charge of linear density 2.0 x 10^(-8) C m^(-1). An electron revolves around it in a circular path under the influence of the attractive electrostatic force. Find the kinetic energy of the electron. Note that it is independent of the radius.

An electron of mass m, moves around the nucleus in a circular orbit of radius .r. under the action of centripetal force .F.. The equivalent electric current is

A long straight wire carries a charge with linear density lamda . A particle of mass m and a charge q is released at a distance r from the the wire. The speed of the particle as it crosses a point distance 2r is

A simple pendulum consists of a small sphere of mass m suspended by a thread of length l . the sphere carries a positive charge q . The pendulum is placed in a uniform electric field of strength E directed vertically upwards. With what period will the pendulum oscillate if the electrostatic force acting on the sphere is less than the gravitational force?

A simple pendulum consists of a small sphere of mass m suspended by a thread of length l . the sphere carries a positive charge q . The pendulum is placed in a uniform electric field of strength E directed vertically upwards. With what period will pendulum oscillate if the electrostatic force acting on the sphere is less than the gravitational force ?

An electron is moving on a circular path of radius r with speed v in a transverse magnetic field B. e/m for it will be

Two infinitely long rods carry equal linear denisty lambda each. They are perpendicular to each other and they are in different planes and separated by a distance d . Find the electrostatic force on once rod due to the other

In the Bohr model of hydrogen atom, the electron is treated as a particle going in a circle with the centre at the proton. The proton itself is assumed to be fixed in an inertial frame. The centripetal force is provided by the Coloumb attraction. In the ground state, the electron goes round the proton in a circle of radius 5.3xx10^-11m . Find the speed of the electron in the ground state. Mass of the electron =9.1xx10^-31 kg and charge of the electron = 1.6xx10^-19C .

A particle having the same charge as of electron moves in a circular path of radius 0.5 cm under the influence of a magnetic field of 0.5 T. If an electric field of 100V/m makes it to move in a straight path, then the mass of the particle is ( Given charge of electron = 1.6 xx 10^(-19)C )

From the surface of a round wire of radius a carrying a direct current i, a positive charge q escapes with a velocity v_0 perpendicular to the surface. Find what the maximum distance of the electron will be from the axis of the wire before it turns back due to the action of the magnetic field generated by the current.