A bar magnet with poles 25 cm apart has a pole strength of 14.4 A-m. What is the magnetic dipole moment of the bar magnet?

  1. 4.5
  2. 2.5
  3. 4.8
  4. 3.6

Answer (Detailed Solution Below)

Option 4 : 3.6
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CONCEPT

  • Magnetic Dipole Moment: For a bar magnet, it is described as the product of pole strength and the distance between the two poles.

m = pl

where m is the magnetic Dipole moment, p is the pole strength, and l is the distance between the two poles.

CALCULATION:

Given that p = 14.4 Am; l = 25 cm = 0.25 m;

m = pl

m = 14.4 × 0.25 = 3.6 Am2

So the correct answer is option 4.

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