A) Since the primary coil is wound on the secondary coil
B) Since the primary coil is of thick wire
C) Since the core is common
D) None of the above
Correct Answer: C
Solution :
Option [c] is correct Explanation: The spark coil designed on the principle of electromagnetic induction was the heart of the earliest radio transmitters. Marconi used a spark coil designed by Heinrich Rhumloff in his early exeriments.
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