Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Questions  >  An open coil hasa)zero resistance and zero in... Start Learning for Free
An open coil has
  • a)
    zero resistance and zero inductance
  • b)
    infinite resistance and infinite inductance
  • c)
    infinite resistance and zero inductance
  • d)
    zero resistance and infinite inductance
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
An open coil hasa)zero resistance and zero inductanceb)infinite resist...

A coil acts as open circuit i.e I = 0 if R = ∞  or L = 0 (so that XL = 0Ω).
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Most Upvoted Answer
An open coil hasa)zero resistance and zero inductanceb)infinite resist...
Explanation:
An open coil means a coil that is not connected to any circuit or source. In this scenario, the coil does not have any current flowing through it, hence there is no magnetic field generated around the coil. Therefore, the coil does not have any self-inductance.

Now, let's consider the resistance of an open coil. An open coil has a finite length of wire that has some resistivity. Hence, there will be some resistance offered by the coil. However, since the coil is not connected to any circuit, there will not be any current flowing through it. Therefore, the effective resistance of the coil will be infinite.

Hence, an open coil has infinite resistance and zero inductance. The correct answer is option 'C'.
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