A magnetic circuit has a continuous core of a ferromagnetic material. Coil is supplied from a battery and draws a certain amount of exciting current producing a certain amount of flux in the core. If now an air gap is introduced in the core, the exciting current will: (A) increase. (B) remain same. (C) decrease (D) become 0.
Answers
Answer:
THE EXCITING CURRENT WILL DECREASE
Answer:
The correct answer is (C) decrease.
Explanation:
From the above question,
A magnetic circuit consists of a magnetic core and a coil that is wound round the core. When a voltage is utilized to the coil, it produces a magnetic area that induces magnetic flux in the core. The quantity of magnetic flux set up in the core relies upon on the magnetic permeability of the core material, which is a measure of the ease with which magnetic flux can be mounted in the core.
When an air gap is introduced in the core of a magnetic circuit, the effective magnetic path length of the circuit increases, which reduces the permeability of the core. This reduction in permeability increases the reluctance of the magnetic circuit, which results in a decrease in the amount of magnetic flux that can be established in the circuit for a given amount of exciting current.
Therefore, the correct answer is (C) decrease. The exciting current will decrease as the magnetic circuit will require more current to produce the same amount of flux that was established before the air gap was introduced.
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