A charge of 10 units is divided so that force between the two charges is maximum when placed 2cm apart. The two charges are

A condenser of 20μF is charged to a certain voltage and then discharged through a 4x10⁶Ω resistor.The time taken for the condenser to lose 63% of its charge is

The charge stored in a capacitor is 20μC and the potential difference across the plates is 500V,its capacity is

Two spheres of radii 12 cm and 16 cm have equal charge. The ratio tstored in the condenser is

Charges +50,+20,+30 and -100 nano coulomb are placed at the four corners of a square of side 5√2cm.The potential at the intersection point of diagonals is

A condenser of capacity 10 μF is charged to a potential of 500 V. Its terminals are then connected to those of an uncharged condenser of capacity 40 μF. The loss of energy in connecting them together is

Two point charges are separated by 3 cm of air and 3 cm of a dielectric of relative permittivity 4.The equivalent air separation between them is (as far as their coulombic interaction is concerned)

Two charges each of 100 micro coulomb are separated in a medium of relative permittivity 2 by a distance of 5cm.The force between them is

Two condensers of capacities 4 μF and 5 μF are joined in series. The potential difference across 5 μF is 10 V then the potential difference across 4 μF condenser is:

A 2μF condenser is charged to 500 V and then the plates are joined through a resistance in joule is