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An example for electromagnetic wave propagation is

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in Electromagnetic Theory by (188k points)
An example for electromagnetic wave propagation is

(a) refrigerator

(b) electric fan

(c) mobile transponder

(d) relays in actuators

The question was asked in an interview for internship.

Asked question is from Plane Waves in Good Conductor in portion EM Wave Propagation of Electromagnetic Theory

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Best answer
Right option is (c) mobile transponder

The best explanation: The refrigerator, electric fan and relays are electrical devices. They do not use electromagnetic energy as medium of energy transfer. The mobile transponder is an antenna, which uses the EM waves for communication with the satellites.

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