In ntp, what stratum consists of atomic devices or gps clocks?

In a network of computers the computers and their time is synchronized with the Network Time Protocol (NTP) protocol. NTP is a hierarchical protocol that uses Coordinated Universal Time (UTC) to synchronize computer clock times to a millisecond, and sometimes to a fraction of a millisecond. The NTP protocol consists of several stratums: Stratum 0 is the reference clock (the gps clock). The devices in Stratum 1 are synchronized with the clock in stratum 0 and have most accurate time.

the higher the current the higher the mag field around it the higher the influence on the compass

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.