The S.I unit of the strength of the magnetic pole is

Correct option is B

Ans.(b) Ampere meter

Explanation:

The correct answer is Ampere meter (A·m). The strength of a magnetic pole is quantified by its magnetic moment (m), which is given by:

$$m=I\times A$$

where:

• $I$ = current (Ampere)
• $A$ = area of the loop (meter²)

The unit of the magnetic dipole moment is Ampere-meter (A·m), which represents the strength of a magnetic pole in relation to the current flowing and the area it encloses.

Information Booster:

● The magnetic dipole moment represents the torque a magnet experiences in an external magnetic field.
● Ampere-meter (A·m) is used to measure the strength of a magnetic dipole.
● The unit is important in electromagnetism and magnetic materials.
● The magnetic field strength of a material depends on its pole strength and the distance between poles.
● Magnetic dipole moment plays a significant role in the alignment of compass needles and earth’s magnetic field interactions.
● Used in determining the strength of bar magnets, solenoids, and electromagnets.
● The unit is applicable in physics, engineering, and geophysics for studying magnetic properties.

Additional Information:

• (a) Newton per meter: Incorrect, as it represents force per unit length
• (c) Ampere per meter: Incorrect, as it represents magnetic field intensity (H)
• (d) Tesla: Incorrect, as Tesla (T) is the unit of magnetic flux density ($B$)