State with reasons whether the following signals are periodic or aperiodic. For periodie Q3. signals, find the period and state which of the harmonics are present in the series. (a) 2 sin(3t) + 7cos(nt) (b) 7 cos(nt)+ 5sin(2nt) (c) 3 cos(vZt) +5 cos(2t) (d) Sin) + 3 cos () + 3sin; + 30°)

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Types of Charge Carriers

A carrier is a type of object which carries a particular thing from one point to another point. For instance, people use different vehicles from one place to another, and the vehicle carries those people and acts as a carrier.