Moving Charges And Magnetism

Step 1: Understanding the magnetic moment. The magnetic moment depends on the number of unpaired electrons. For Cr^{3+} (with atomic number 24), the electron configuration is , meaning there are 3 unpaired electrons.

Step 2: Calculation. The magnetic moment ( ) is calculated using the formula: Where is the number of unpaired electrons. For Cr^{3+} (3 unpaired electrons), we get:

Step 3: Conclusion. Thus, the magnetic moment is 3.87 B.M., corresponding to option (B). \vspace{10pt}