Charged Disk

A point charge Q is located on the axis of a disk of radius R at a distance b from the plane of the disk. Show that if one-fourth of the electric flux from the charge passes through the disk, then R = sqrt(3b) .

At what distance along the central perpendicular axis of a uniformly charged plastic disk of radius 0.600 m is the magnitude of the electric field equal to 25% of the magnitude of the field at the center of the surface of the disk ?

Continuous charge distribution(linear, surface and volumetric), Electric field due to slender rod, Electric field on the axis of a uniformly charged ring and disk

A thin circular disk of radius R is uniformly charged with density sigma gt 0 per unit area.The disk rotates about its axis with a uniform angular speed omega .The magnetic moment of the disk is :

By viewing the properties of the local hard disk of a computer, the user can find out