The pumping lemma tells us that any arbitrary regular language has a pumping length p, with the property that every string in this language can be pumped if it has length at least p. In fact, ifp is a pumping length for some language L, then so is any length p> p. Define the smallest pumping length for L to be the smallest nonnegative integer p such that p is a pumping length for L. As an illustration, if I

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

i think the answer is a, hope this : )

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.