In the United Kingdom (and many other European countries), residents are not allowed to use a TV without purchasing a yearly license. Fines of 1000 British pounds are levied against those who are caught using a TV without a license. The law is enforced through devices that can detect a TV in use from 20 m away or more. Figure Q23.9 shows a van that contains one of these devices. (Note the antennas on top of the van.) How might this device work? Hint: All TVs have LRC circuits in them. 

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Antennas ffou TV Figure Q23.9