Potential at the centre of ring of radius 'R' is (charge of upper semi circle is Q and lower semi circle is -Q)

A dipole of dipole moment P is kept at the centre of a ring of radius R and charge Q. If the dipole lies along the axis of the ring. Electric force on the ring due to the dipole is : (K = (1)/(4pi epsilon_(0)))

A point charge q is held at the centre of a circle of radius r. B,C are two points on the circumference of the circle and A is a point outsdie the circle . If W_("AB") charge q_(e ) from A to B and W_("AC") represents the workdone from A to C ,then

Metallic sphere of radius R is charged to potential V. Then charge q is proportional to

Draw a semi-circle with centre O and radius 5 cm. Is the diameter that determines the semi-circle, a part of the semi-circle?

A plastic rod has been formed into a circle of radius R. It has a positive charge +Q uniformly distributed along one-quarter of its circumference and a negative charge of -6Q uniformly distributed along the rest of the circumference (figure). With V = 0 at infinity, what is the electric potential -6Q (a) at the centre C of the circle and (b) at point P, which is on the central axis of the circle at distance z from the centre?

A point charge q is located at the centre fo a thin ring of radius R with uniformly distributed charge -q , find the magnitude of the electric field strength vectro at the point lying on the axis of the ring at a distance x from its centre, if x gt gt R .

Three equal point charges of charge +q each are moving along a circle of radius R and a point charge -2q is also placed at the centre of circle (as shown in figure). If charge are revolving with constant and same speed in the circle then calculate speed of charges

A charge 'q' is placed at the centre of a conducting spherical shell of radius R, which is given a charge Q. An external charge Q' is also present at distance R' (R' gt R) from 'q'. Then the resultant field will be best represented for region r lt R by : [where r is the distance of the point from q]

An unchanged conducting sphere of radius R is placed near a uniformly charge ring of radius R. Total charge on ring is Q. The centre of sphere lies on axis of ring and distance of centre of sphere from centre of ring is R

A spherical conductor having charge q and radius r is placed at the centre of a spherical shell of radius R and having charge Q (R gt r). The potential difference between the two is