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qUESTIONS

A spherical conductor of diameter 6 mm is kept in uniform electric field of intensity 2 × 107 N/C. The maximum charge on the conductor is

A series combination of N₁ capacitors (each of capacity C₁) is charged to potential difference ‘3V’. Another parallel combination of N₂ capacitors (each of capacity C₂) is charged to potential difference ‘V’. The total energy stored in both the combinations is same. The value of C1 in terms C₂ is

In parallel plate capacitor, electric field between the plates is ‘E’. If the charge in the plates is ‘Q’ then the force on each plate is

Four electric charges +q, +q, -q and -q are placed in order at the corners of a square of side ‘2r’. The electric potential at the centre of square is

Four indentical condensers are connected in parallel and then in series. The ratio of equivalent capacitance in series to that in parallel combination is

The force between the plates of a parallel plate capacitor of capacitance ‘C’ and distance of separation of the plates ‘d’ with a potential difference ‘V’ between the plates is

A parallel plate capacitor with air between the plates has capacitance of 12µF. If the distance between the plates is reduced to half and space between them is filled with a substance of dielectric constant 4, then new capacitance will be

A parallel combination of three condensers of capacities ‘2C’, ‘C’ and ‘C/2’ is connected across 10 V battery. All the condensers are fully charged to charges ‘Q1’, ‘Q2’ and ‘Q3’ respectively. Then the ratio Q1: Q2: Q3 is:

A parallel plate air filled capacitor of capacitance ‘C’ has plate area ‘A’ and the distance between the plates ‘d’. When a metal sheet of thickness d/2 and of the area ‘A’ is introduced between the plates, its capacitance become ‘C2’. The ratio C2 : C1, is

A charge Q µC is placed at the centre of a cube. If ∈0 is the permittivity of vacuum then the flux through one face and two opposite faces of the cube is respectively

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