Question

Bohr Magneton value in S.I. units is

• A. $9.273 \times 10^{-24}$ erg T$^{-1}$
• B. $9.273 \times 10^{-24}$ J T$^{-1}$
• C. $9.273 \times 10^{-17}$ J T$^{-1}$
• D. $9.273 \times 10^{-10}$ cal T$^{-1}$

Hint:

Always remember: the Bohr magneton in S.I. units is approximately $9.27 \times 10^{-24}$ J T$^{-1}$.

Answer 1

The Correct Option is B

Step 1: Recall the definition of the Bohr magneton ($\mu_B$). It is the natural unit of magnetic moment for an electron.
Step 2: The Bohr magneton in S.I. units is given by: \[ \mu_B = \frac{e\hbar}{2m_e} \]
Step 3: Its standard numerical value in S.I. units is: \[ \mu_B = 9.274 \times 10^{-24} \ \text{J T}^{-1} \]
Step 4: Among the given options, option (B) correctly represents the Bohr magneton in joule per tesla (J T$^{-1}$), which is the S.I. unit.