The space between two thin concentric metallic spherical shells of radii a and b is filled with a thermal conducting medium of conductivity k. The inner shell is maintained at temperature `T_(1)` and outer is maintained at a lower temperature`T_(2)` . Calculate the rate of flow of heat in radially outward direction through the medium.

Explanation

To solve the problem of calculating the rate of flow of heat in the radially outward direction through the medium between two concentric metallic spherical shells, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Setup**:
- We have two concentric metallic spherical shells with radii \( a \) (inner shell) and \( b \) (outer shell).
- The inner shell is maintained at temperature \( T_1 \) and the outer shell at temperature \( T_2 \) (where \( T_1 > T_2 \)).
- The space between the shells is filled with a thermal conducting medium of conductivity \( k \).
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