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Coupling

Magnetic line...

Question

Magnetic lines of force causes

A

The picture on a computer screen

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B

Radio reception interference

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C

Aurora Borealis

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D

V.H.S. films

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E

All of these

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Solution

The correct option is E Aurora Borealis
The picture on a computer screen is caused by an electron beam that sweeps the screen horizontally. The scanning motion is created by using 2 sets of electromagnetic coils wound around a magnetic core which exerts magnetic force on the beam.
The rest are not caused by magnetic lines of forces. For e.g. Aurora Borealis is caused by collision of electrons with the upper reaches on Earth's atmosphere.

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