Which of these act perpendicular to each other to produce an electromagnetic wave? (2 points) a. changing crests and troughs b changing electric and magnetic fields c changing compression and energy transfer d changing longitudinal and transverse waves

Changing electric and magnetic fields            

Explanation:

An electric field is produced due to a charged particle. The electric field due to a positive charge is outwards and for negative charge it is inwards.

Moving charged particle is responsible for the production of magnetic field. Electromagnetic waves are produced due to oscillating electric and magnetic field components. These two waves oscillate perpendicularly to each other and both are in phase with each other i.e. we can say that an accelerating charged particle produce electromagnetic waves.

So, the correct option is (b) " changing electric and magnetic fields ".

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