What is the formula for Bohr magneton?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-online-test-q6a1.png"><img alt="The formula for Bohr magneton - option a" class="size-full wp-image-239187" height="49" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-online-test-q6a1.png" width="32"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-online-test-q6b.png"><img alt="The formula for Bohr magneton - option b" class="size-full wp-image-239188" height="50" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-online-test-q6b.png" width="39"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-online-test-q6c.png"><img alt="The formula for Bohr magneton - option c" class="size-full wp-image-239189" height="44" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-online-test-q6c.png" width="37"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-online-test-q6d.png"><img alt="The formula for Bohr magneton - option d" class="size-full wp-image-239190" height="47" src="https://www.sanfoundry.com/wp-content/uploads/2018/05/engineering-materials-metallurgy-questions-answers-online-test-q6d.png" width="35"/></a>