A charge Q is distributed over a line of length L Another point charge q is placed at a distance r from the centre of the line distribution.Then the force experienced by q is

A charged particle q is placed at the centre O of a cube of lenngth L (ABCDEFGH). Another charge q is placed at a distance L from O. then the electric flux emerging from q at O is

A ring of radius R carries a uniformly distributed charge +Q. A point charge -q is placed on the axis of the ring at a distance 2R from the centre of the ring and released from rest. The particle executes a ismple harmonic motion along the axis of the ring.

A charged spherical conductor of radius R carries a charge Q. a point charge q is placed at an outside point at a distance x from the surface of the sphere. The force experienced by the point charge will be proportional to

Inside a neutral hollow conducting sphere of radius X and centre C, a point charge q is placed as shown in the figure. Another point charge q_1 , is placed outside the sphere at distance d from centre. The net- electrostatic force on charge q placed at the centre is K=1/(4piepsilon_0)

A conducting spherical shell is earthed. A positive charge +q_1 is placed at the center and another small positive charge +q_2 is placed at a distance r from q_1 . Ignore the effect of induced charge due to q_2 on the sphere. Then the coulomb force on q_2 is

On an insulated rod having length L Q charge is evenly distributed and a point charge q is placed at a distance d from are of its ends as shown. What will be total electric force on q? q A B

A regular polygon has "20" sides.Equal charges,each "Q" ,are placed at "19" vertices of the polygon and a charge "q" is placed at the centre of polygon.If the distance of each vertex from the centre is 'a' net force experienced by "q" is -