An electron moves straight inside a charged parallel plate capacitor of uniform surface charge density σ. The space between the plates is filled with constant magnetic field of induction B . The time of straight line motion of the electron in the capacitor is: The magnetic field at distance y from the centre on the [...]

The magnetic field at distance y from the centre on the axis of a disk of radius r and uniform surface charge density σ spinning with angular velocity ω is, The magnetic field at distance y from the centre on the axis of a disk of radius r and uniform surface charge density σ spinning [...]