transformer makes use of mutual induction for its operation in which change in magnetic field in one coil due to variation of current , induces voltage in the other coil. so changing magnetic field in the primary coil is very much needed for the transformer. Alternating current is a current which varies with time , hence it is suitable to produce changing magnetic field in the primary coil. on the other hand , the direct current remains constant all the time. hence can not produce a changing magnetic field. so DC current is not useful for transformers.
It is D. X rays have a shorter wavelength than microwaves.
Answer: car 1 is going how fast
Explanation: no need to answer without speed I won't know distance.
Answer:
A. For every action there is an equal and opposite reaction.
