A soap bubble is charged to a potential of 16 V. Its radius is, t

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 Multiple Choice QuestionsMultiple Choice Questions

261.

Figure below shows four plates each of area A and separated from one another by a distance d

What is the capacitance between P and Q ?

  • ε0Ad

  • 2ε0Ad

  • 3ε0Ad

  • 4ε0Ad


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262.

A soap bubble is charged to a potential of 16 V. Its radius is, then doubled. The potential of the bubble now will be

  • 16 V

  • 8 V

  • 4 V

  • 2 V


B.

8 V

Potential on bubble, V = 14πε0 qr    V1V2 = r2r1   16V2 = 21    V2  = 8 V


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263.

4 point charges each +q is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre is

  • 0

  • 4qd

  • 4dq

  • q4d


264.

64 identical spheres of charge q and capacitance C each are combined to form a large sphere. The charge and  capacitance of the large sphere is

  • 64q, C

  • 16q, 4C

  • 64q, 4C

  • 16q, 64C


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265.

If the charge on a capacitor is increased by 2 coulomb, the energy stored in it increases by 21 %. The original charge on the capacitor is

  • 10 C

  • 20 C

  • 30 C

  • 40 C


266.

Four capacitors of equal capacitance have an equivalent capacitance C1 when connected in series and an equivalent capacitance C2 when connected in parallel. The ratio C1C2 is

  • 1/4

  • 1/16

  • 1/8

  • 1/12


267.

In the figure below, the capacitance of each capacitor is 3 µF. The effective capacitance between A and B is

       

  • 34 μF

  • 3 µF

  • 6 µF

  • 5 µF


268.

The charge on the capacitor of capacitance C shown in the figure below will be

    

  • C E

  • C E R1R1 + r

  • CER2R2 + r

  • CER1R2 + r


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269.

In the adjoining figure, the potential difference between X and Y is 60 V. The potential difference between the points M and N will be

          

  • 10 V

  • 15 V

  • 20 V

  • 30 V


270.

A, B and C are three points in a uniform electric field. The electric potential is

          

  • maximum at A

  • maximum at B

  • maximum at C

  • same at all the three points A, B and C


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