Ten charges are placed on a meter stick at regular interval starting from 10cm mark at an interval of 10cm .The magnitude of the charges are q, 4q , 9q,........Find the field intensity (in SI unit) at the zero mark of the stick.(q=1micro coulomb)

Five point charges, each +q are placed on five vertices of a regular hexagon of side' l '. Find the magnitude of the resultant force on a charge –q placed at the centre of the hexagon.

Three charge -q,+q and -q are kept at the veticles of an equllateral triangle of 10cm side.The potential at the mid point in between -q,-q, if q=5muC is

Five point charges, each of value +q are placed on five vertices of a regular hexagon of side Lm. What is the magnitude of the force on a point charge of value -q coulomb placed at the centre of the hexagon?

Three charges are placed at the vertices of an equilateral triangle of side 10 cm. Assume q_(1)=1 muC,q_(2)=-2 muC and q_(3)=4 muC . Work done in separating the charges to infinity is

An ionfinite number of charges each q are placed in the x-axis at distances of 1,2,4,8 meter from the origin. If the charges are alternately positive and negative find the intensity of electric field at origin.

Three point charges -Q, Q and Q are placed on a straight line with distance d between charges as shown. Find the magnitude of the electric field at the point P in the configuration shown which is at a distance a from middle charge Q in the system provided that a gt gt d . Take 2Qd=p .

(a) Three point charges q,-4q and 2q are placed at the vertices of an equilateral triangle ABC of side 'l' as shown in the figure. Obtain the expression for the magnitude of the resultant electric force acting on the charge q. (b) Find out the amount of the work 4one to separate the charges at infinite distance.

Two charges 4q and q are placed 30 cm. apart. At what point the value of electric field will be zero