Assertion: relay's coil | /r/CapableOf | build up magnetic field
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Source sentences:
text: The Operate Time of a relay includes the time for the coil to build up the magnetic field (magnetic attraction is necessary to attract and close the contact), the transfer time of the moveable contact (from its open to its close position), and the bounce time after the closing of the switch (relays can bounce up and down a number of times before finally settling permanently in its close position).