Determination Of Magnetic Moment Of The Given Bar Magnet Using Deflection Magnetometer (tan-a Position)

APPARATUS REQUIRED:

• Deflection magnetometer
• Bar magnet 
• Compass box 
• Scale 
• Leveling screws 
• Spirit level 
• Weights 
• Thread

THEORY:

The magnetic moment of a bar magnet can be determined using a deflection magnetometer in the Tan-A position. In this position, the magnet is placed parallel to the magnetic meridian, and the deflection angle is measured. The magnetic moment (\(M\)) can be calculated using the formula \(M = \frac{{n \cdot B \cdot A}}{{2 \cdot \tan(\frac{\theta}{2})}}\), where \(n\) is the number of divisions, \(B\) is the Earth's magnetic field, \(A\) is the area of the magnet, and \(\theta\) is the deflection angle.

PROCESS: 

1. Set up the deflection magnetometer with leveling screws and a compass box.
2. Place the bar magnet in the Tan-A position parallel to the magnetic meridian.
3. Level the magnetometer using the spirit level.
4. Measure the deflection angle (\(\theta\)) using the scale. 
5. Repeat the experiment with different weights attached to the magnet to vary the deflection.

OBSERVATIONS:

Deflection angle (\(\theta\)): 30 degrees

OBSERVATION TABLE:

                         

Weight (W)	Deflection Angle (\(\theta\))
1 gram	30 degrees

CALCULATION:

Calculate the magnetic moment (\(M\)) using the formula \(M = \frac{{n \cdot B \cdot A}}{{2 \cdot \tan(\frac{\theta}{2})}}\).

RESULTS:

The magnetic moment of the given bar magnet is ____________ Am².

PRECAUTIONS: 

1. Ensure the magnetometer is properly leveled. 
2. Place the bar magnet accurately in the Tan-A position. 
3. Avoid magnetic interference in the vicinity. 
4. Record precise measurements of deflection angles.