The units of magnetic pole strength and magnetic dipole moment of a bar magnet area)A-m, JT-1b)JT-1, Am-1c)JT-1, Amd)Am-1, JT-1Correct answer is option 'A'. Can you explain this answer?

Question

Answer

Answer

M(magnetic pole strength )=I(current)×l(length )
m=A.m

M(magnetic dipole moment)=m(magnetic pole strength )×l(length of bar magnet/distance b/w the poles)
M =Am2
M=JT-1

Answer

Magnetic pole strength and magnetic dipole moment are two important quantities used to describe the properties of a bar magnet. Let's understand what these quantities represent and why the correct answer is option 'A': A-m, JT-1.

- Magnetic Pole Strength:
The magnetic pole strength represents the strength or intensity of the magnetic poles of a magnet. It is denoted by the symbol 'm' and its SI unit is Ampere-meter (A-m). The magnetic pole strength is a scalar quantity and can be positive or negative depending on the type of pole (North or South).

- Magnetic Dipole Moment:
The magnetic dipole moment is a measure of the strength and orientation of a magnet's magnetic field. It is defined as the product of the magnetic pole strength and the distance between the poles. Mathematically, it is represented as the vector product of the magnetic pole strength and the separation vector between the poles. The SI unit of magnetic dipole moment is Ampere-meter squared (Am2).

Now let's analyze the given options:

a) A-m, JT-1:
This option states that the units of magnetic pole strength are A-m (Ampere-meter) and the units of magnetic dipole moment are JT-1 (Joule-Tesla inverse). This is the correct answer because it correctly represents the units of both quantities.

b) JT-1, Am-1:
This option states that the units of magnetic pole strength are JT-1 (Joule-Tesla inverse) and the units of magnetic dipole moment are Am-1 (Ampere-meter inverse). This is incorrect because the units of magnetic pole strength should be A-m and not JT-1.

c) JT-1, Am:
This option states that the units of magnetic pole strength are JT-1 (Joule-Tesla inverse) and the units of magnetic dipole moment are Am (Ampere-meter). This is incorrect because the units of magnetic pole strength should be A-m and not JT-1.

d) Am-1, JT-1:
This option states that the units of magnetic pole strength are Am-1 (Ampere-meter inverse) and the units of magnetic dipole moment are JT-1 (Joule-Tesla inverse). This is incorrect because the units of magnetic pole strength should be A-m and not Am-1.

In conclusion, the correct answer is option 'A': A-m, JT-1, as it represents the units of magnetic pole strength and magnetic dipole moment of a bar magnet correctly.

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