Question

A capncilor is tormed from two concentric spherical Part A conducting shells weparated by vacuam. The inner Bphere has radius 11.0 cm, and tho outer sphere has What is the energy density at r=11.1 cm, just outside the inner sphere? radius 15,0 cm. A potontial ditference of 140.0 V is applied to the copacitor. Express your answer in joules per meter cubed. Part B What is the energy densty at r=14.9crm. just inside the outer tohere? Express your answer in joules per meter cubed.

Answer 1

For Part A

The energy density at r=11.1 cm just outside the inner sphere, is 25.9 J/m3

For Part B
The energy density at r=14.9 cm, just inside the outer sphere, is 24.1 J/m3

Both of these energy densities are determined using the formula for the potential energy of a charged object

U=qV
Where q is the charge, and V is the voltage, to get this energy density in joules per meter cubed we then divide by the volume