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)

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 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

Charges q is uniformly distributed over a thin half ring of radius R . The electric field at the centre of the ring is

A charge +Q is uniformluy distributed over a thin ring with radus R. a negative point charge -Q and mass m starts from rest at a pont far away from the centre of the ring and moves towardsn then centre. Find the velocity of this particle at the moment it passes through the centre of the ring .