Write the expression for total energy of an electron in `n^(th)` orbit.

Explanation

To derive the expression for the total energy of an electron in the \( n^{th} \) orbit according to Bohr's theory, we can follow these steps:

### Step 1: Understanding the Concept
According to Bohr's model of the atom, electrons move in fixed orbits around the nucleus, and the total energy of the electron in these orbits can be expressed in terms of its kinetic and potential energy.

### Step 2: Kinetic Energy (KE)
The kinetic energy of an electron in the \( n^{th} \) orbit can be expressed as:
\[
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