A) vibrations created by the passage of aircraft
B) change of magnetic flux occurring due to the passage of aircraft
C) diffraction of the signal received from the antenna
D) None of the above
Correct Answer: B
Solution :[b] A low flying aeroplane causes a change in magnetic flux and hence causes disturbance. When low flying aeroplane passes overhead, it will cut Earth magnetic field, causing motional emf across the plane. Due to cutting of the magnetic field flux is also changing, As we know that flux is field multiplied by area, here area is changing. Motional emf also depends upon speed, length as well as, magnitude of the field.
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