A capacitor is constructed using concentric conducting spheres. The inner sphere has radius a, the outer sphere (a thin-walled shell) has radius b. (a) Show that the capacitance is ab k(b-a) when the space between the inner and outer spheres is empty. Start with our result from Gauss's law for the field outside a spherical charge distribution - you do not have to re-derive that, but please DO derive the potential difference between the spheres.

University Physics Volume 2
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Chapter6: Gauss's Law
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Problem 86AP: Two non-conducting spheres of radii R1 and R2 are uniformly charged with charge densities p1 and p2...
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A capacitor is constructed using concentric conducting spheres. The inner sphere has radius a, the
outer sphere (a thin-walled shell) has radius b.
(a) Show that the capacitance is
ab
k(b
- a)
when the space between the inner and outer spheres is empty. Start with our result from Gauss's
law for the field outside a spherical charge distribution - you do not have to re-derive that, but
please DO derive the potential difference between the spheres.
Transcribed Image Text:A capacitor is constructed using concentric conducting spheres. The inner sphere has radius a, the outer sphere (a thin-walled shell) has radius b. (a) Show that the capacitance is ab k(b - a) when the space between the inner and outer spheres is empty. Start with our result from Gauss's law for the field outside a spherical charge distribution - you do not have to re-derive that, but please DO derive the potential difference between the spheres.
(b) What is the capacitance if a = 0.1 m and b = 0.103 m?
(c) What would the capacitance be if we filled the gap with Aluminum Oxide (and again, make
a = 0.1 m and b = 0.103)?
(d) Consider the limit when a and b are approximately equal (the shell wall is extremely thin.)
What happens to the capacitance, mathematically? What is a physics explanation for this?
Transcribed Image Text:(b) What is the capacitance if a = 0.1 m and b = 0.103 m? (c) What would the capacitance be if we filled the gap with Aluminum Oxide (and again, make a = 0.1 m and b = 0.103)? (d) Consider the limit when a and b are approximately equal (the shell wall is extremely thin.) What happens to the capacitance, mathematically? What is a physics explanation for this?
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