A changing current in a coil sets up a changing magnetic field around it which in turn induces an e.m.f. in it. This effect is known as _
Correct answer: C. Self-induction
- A. Simple induction
- B. Mutual induction
- C. Self-induction
- D. EMF induction
Explanation
The correct answer is self-induction. This is because a changing current in a coil leads to a changing magnetic field, which induces an emf within the same coil. This specific phenomenon is known as self-induction.Option A, 'Simple induction', is not a recognized term in electromagnetism for this process. Option B, 'Mutual induction', involves two different coils, where a change in current in one induces emf in the other, which is not the case here. Option D, 'EMF induction', is a generic term and does not specify the process as accurately as 'self-induction'.
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Magnetic flux density and magnetic flux describe the strength of a magnetic field and the field passing through a surface. A charged particle moving through a magnetic field experiences a force perpendicular to its velocity and may follow circular or helical motion, depending on the angle between velocity and field.
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