electrostatic field and capacitance 3

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1.A parallel plate capacitor is charged by a battery. Once it is charged battery is removed.Now a dielectric material is inserted between the plates of the capacitor, which of the following does not change?

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electric field between the plates

potential difference across the plates

charge on the plates

energy stored in the capacitor.

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2. Two conducting spheres A and B of radii a & b respectively are at the same potential. The ratio of surface charge densities of A and B is

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a/b

b/a

a^2 / b^2

b^2 / a^2

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3.Two capacitors each of capacitance 2μF are connected in series. Equivalent capacitance will be

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1μF

2μF

3μF

4μF

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4.Two capacitors each of capacitance 2μF are connected in parallel. Equivalent capacitance will be

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1μF

2μF

3μF

4μF

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5. if Cs and Cp are the equivalent capacitance of n identical capacitors when connected in series and parallel respectively then ratio Cs/ Cp will be

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1/n

n^2

1 / n^2

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6. A capacitor plates are charged(Q) by a battery . After charging battery is disconnected and a dielectric slab(K) is inserted between the plates, the charge on the plates of capacitor

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Q/2

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7. A capacitor plates are charged by a battery to potential V . After charging battery is disconnected and a dielectric slab(K) is inserted between the plates, the potential difference between the plates of capacitor will be

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V/K

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8. A capacitor plates are charged by a battery . After charging battery is disconnected and a dielectric slab(K) is inserted between the plates, the energy stored between the plates of capacitor will be

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U/K

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9. The value of potential energy of an electric dipole in uniform electric field when the angle between P and E are 0, 90 and 180 are respectively as

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PE , 0, - PE

0, PE , -PE

PE, 0, 2PE

-PE, 0, PE

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10. If potential energy of dipole at orientation Π/6 in uniform field is U, its potential energy at orientation Π/3 will be

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√3/U

U / √3

U/2

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