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Earn 100

Eight drops of mercury of equal radii and possessing equal charges combine to form a big drop. Then the capacitance of the bigger drop compared to each individual drop is  .........................

Important Questions on Capacitance

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NEET
IMPORTANT

The capacitance of a spherical condenser whose inner sphere is grounded is 1 µF. If the spacing between the two spheres is 1 mm, then what is the radius of the outer sphere?

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When 1.0×1012 electrons are transferred from one conductor to another, a potential difference of 10 V appears between the conductors. Calculate the capacitance of the two-conductor system.
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The graph shows the variation of voltage V across the 

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plates of two capacitors A and B with charge Q.

Which of the two capacitors has larger capacitance?

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For flash pictures, a photographer uses a 30 µF capacitor and a charger that supplies 3×103 volt. Calculate the charge and the energy spent for each flash.

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Two capacitors C1 and C2 have an equal amount of energy stored in them. What is the ratio of potential differences across their plates?

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A parallel plate capacitor has rectangular plates with dimensions 6.0 cm×8.0 cm. If the plates are separated by a sheet of Teflon K=2.1 1.5 mm thick, how much energy is stored in the capacitor when it is connected to a 12 V battery?

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The distance between plates of a parallel plate capacitor is d. Another thick metal plate of thickness d2 and area same as that of the plates is so placed between the plates, that it does not touch the plates. The capacity of the resultant capacitor
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The capacity and the energy stored in a parallel plate condenser with air between its plates are, respectively, C0 and W0. If the air between the plates is replaced by the glass (dielectric constant=5). Find the capacitance of the condenser and the energy stored in it.