Electrostatics Mock Tests

An electric dipole of dipole moment p is placed in a uniform electric field E. The maximum torque experienced by the dipole is

Two point charges +4q and +q are placed 12 cm apart. A third charge is placed on the line joining them such that the system is in equilibrium. The distance of the third charge from the +4q charge is:

Two point charges +q and -q are placed at vertices A and B of an equilateral triangle ABC of side a. A third charge Q is placed at C. The net force on charge Q is proportional to:

Three identical charges q are placed at the vertices of an equilateral triangle of side a. The potential energy of this system is:

Two point charges +3 μC and −3 μC are placed 2 mm apart forming an electric dipole. The electric field at a point on the axial line at distance 20 cm from the center is approximately in the direction:

A parallel plate capacitor has capacitance 10 pF in air. If a dielectric of constant K = 4 is inserted filling half the area between the plates (the other half remaining air), the new capacitance is:

A parallel plate capacitor with plate area A and separation d is charged to a potential difference V. The plates are then disconnected from the battery and pulled apart to a separation 2d. The work done in pulling the plates apart is:

A parallel plate capacitor is charged to voltage V and then disconnected. If the plate separation is doubled, the new voltage is: