线圈

线圈	xiàn quān	solenoid (electrical engineering) / coil
线	xiàn	variant of 线
线	xiàn	thread / string / wire / line / CL:条,股,根 / (after a number) tier (unofficial ranking of a Chinese city)
圈	juān	to confine / to lock up / to pen in
圈	juàn	livestock enclosure; pen; fold; sty
圈	quān	circle; ring; loop (CL:个) / classifier for loops, orbits, laps of race etc / to surround; to circle