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The radius of earth is 6400 km. Then, its capacitance is,

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Important Questions on Electrostatics

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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 15
125 water drops of equal radii and equal capacitance C coalesce to form a single drop of capacitance C'. The relation between C and C' is,
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IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 16
A capacitor of capacitance 10 μF has been charged to 100 V. It is now connected in parallel to another uncharged capacitor C. The common potential becomes 40 V. The capacitance of the other capacitor C is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 17
A point charge of 5 μC is placed at the center of a sphere of radius 9.2 m. If ε0=8.854×10-12 C2 N-1 m-2, then the electric flux through the surface of the sphere will be
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 18
The capacitance of a parallel plate capacitor 10 μF. If now the overlapping area of plates are doubled and separation of the plates is halved, then the new capacitance will be
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 19
The diameter of each plate of an air capacitor is 4 cm. To make the capacity of this parallel plate capacitor equal to that of the sphere of diameter 20 cm, the distance between the plates will be
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 20
A conductor bears a charge of 2 mC at potential 103 V. The capacitance of capacitor is
EASY
NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 21
The energy density (energy per unit volume) in an electric field caused by a point charge falls off with the distance from the point charge as
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NDA & NA EE
IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Physics>Chapter 10 - Electrostatics>Practice Exercise>Q 22
A battery used for charging an air capacitor is removed after the capacitor is fully charged. Some mica sheets (dielectric constant K ) are inserted between the two plates. If E is the energy of the air capacitor, then the energy stored in the mica capacitor will be