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qUESTIONS

Shown below is a distribution of charges. The flux of electric field due to these charges through the surface S is

A parallel plate condenser has a capacitance 50µF in air and 150µF when immersed in an oil. The dielectric constant ‘k’ of the oil is

An electric dipole is as shown in figure. The electric potential at point P due to the dipole is: ( ε0= Permittivity of free space)

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

Two capacitors C and C/2 are connected to a battery of V volt as shown below. The work done in charging both the capacitor fully is

A parallel plate capacitor is charged by a battery and then disconnected. The dielectric slab of constant ‘K’ is then inserted between the plates. Then potential difference between the plates (K>1)

The capacity of a pure capacitor is 1F. In d.c. circuits, its effective resistance will be

A capacitor of unknown capacity is connected across a battery of V volt. The charge stored in it is ‘Q’ C. When potential across a capacitor is reduced by V’ volt, the charge stored in it becomes Q’ C. The potential V is

The capacitance of a parallel plate capacitor with air as medium is 3 µF. With the introduction of a dielectric medium between the plates, the capacitance becomes 15 µF. The permittivity of the medium in SI unit is (ε0= 8.85 × 10^-12 SI unit)

Two finite parallel charged plates having air between them have charge densities +σ and -σ respectively and they are separated by a small distance. If the permittivity of the air is &, then the electric field between the two plates will be

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