Question

state SI units of pole strength

Answer 1

If you define it as force per unit B field, then the SI unit is the ampere-meter (A m). It can also be defined as the force per unit H field, in which case the SI unit is the weber (Wb). The magnetic B and H fields are dimensionally equivalent, and pole strength is measured in unit poles.
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Answer 2

In SI units, there are two possible units for magnetic pole strength, depending on how pole strength is defined. If you define it as force per unit B field, then the SI unit is the ampere-meter (Am). It can also be defined as the force per unit H-field, in which case the SI unit is the weber (Wb).

In CGS-Gaussian units, the magnetic B and H fields are dimensionally equivalent, and pole strength is measured in unit poles.