EASY
JEE Advanced
IMPORTANT
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Eight drops of mercury of equal radii combine to form a big drop. The capacitance of the bigger drop as compared to each smaller drop is:

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Important Questions on Electrostatics

MEDIUM
JEE Advanced
IMPORTANT

A slab of copper of thickness b is inserted in between the plates of parallel plate capacitor as shown in figure. The separation of the plate is d. If b=d2, then the ratio of capacities of the capacitor after and before inserting the slab will be

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MEDIUM
JEE Advanced
IMPORTANT

Consider a parallel plate capacitor of capacity 10 μF with air-filled in the gap between the plates. Now, one-half of the space between the plates is filled with a dielectric of dielectric constant 4, as shown in the figure. The capacity of the capacitor changes to,

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EASY
JEE Advanced
IMPORTANT
The capacity of a spherical condenser is 1 μF. If the spacing between the two spheres is 1 mm, the radius of the outer sphere is
MEDIUM
JEE Advanced
IMPORTANT

Four capacitors are connected in a circuit as shown in the figure. The effective capacitance between points A and B will be

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MEDIUM
JEE Advanced
IMPORTANT

The equivalent capacitance between the points A and C is given by

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EASY
JEE Advanced
IMPORTANT
A thin metal plate P is inserted between the plates of a parallel-plate capacitor of capacitance C in such a way that its edges touch the two plates. The capacitance now becomes
EASY
JEE Advanced
IMPORTANT
A parallel plate capacitor has plate separation d and capacitance 25 μF. If a metallic foil of thickness 27d is introduced between the plates, the capacitance would become