10 \, \text{mm} = 0.0001 \, \text{m} \)
- Outer radius, \( r_2 = 0.60 \, \text{mm} = 0.0006 \, \text{m} \)
- Relative permittivity of polystyrene, \( \epsilon_r = 2.5 \)
- Vacuum permittivity, \( \epsilon_0 = 8.85 \times 10^{-12} \, \text{F/m} \)
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