Find the expression of radius of an orbit of electron in terms of nucleus charge `Q_2`, tangential velocity v and mass of electron `m_e` ?

Explanation

To find the expression for the radius of an orbit of an electron in terms of the nucleus charge \( Q_2 \), tangential velocity \( v \), and mass of the electron \( m_e \), we can follow these steps:

### Step 1: Understand the Forces Acting on the Electron
The electron in orbit around the nucleus experiences two main forces:
1. **Centripetal Force (Fc)**: This force is required to keep the electron in circular motion and is given by:
\[ F_c = \frac{m_e v^2}{r} \]
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