The magnetic induction due to the electron revolving in the first Bohr orbit of hydrogen atom at the centre of the orbit is B. If the electron is revolving in the second Bohr orbit the magnetic induction at the centre will be

Explanation

To solve the problem of finding the magnetic induction at the center of the second Bohr orbit of a hydrogen atom, we can follow these steps:

### Step-by-Step Solution

1. **Understanding Magnetic Induction**: The magnetic induction (B) due to a current-carrying loop can be expressed as:
\[ B = \frac{\mu_0 I}{2R} \]
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