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Question about Capacitance

Physics

Originais Teachy

Capacitance

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(Originais Teachy 2023) - Question Medium of Physics

A spherical capacitor is used in a laboratory to store electrical energy and has an internal radius of 5 cm and an external radius of 10 cm. It is desired to increase the energy storage capacity of this capacitor while maintaining the separation of the two spheres and using materials with the same dielectric constant and surface charge density. How should this modification be made to the internal and external radii in order to double the energy storage capacity of this spherical capacitor?
a.
Reduce the internal radius by half and double the external radius.
b.
Duplicate the internal radius and keep the external radius constant.
c.
Duplicate both the internal and external radii.
d.
Duplicate the external radius and keep the internal radius constant.
e.
Keep both the internal and external radii constant and double the distance between them.

Answer:

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