Current can be induced in a coil by changing the area of coil placed in:
Correct answer: A. Uniform magnetic field
- A. Uniform magnetic field
- B. Uniform magnetic and electric field
- C. Uniform electric field
- D. All of these
Explanation
The correct answer is Uniform magnetic field. According to Faraday's law of electromagnetic induction, an electromotive force (EMF) is induced in a coil when there is a change in magnetic flux through the coil. Changing the area of the coil within a uniform magnetic field alters the magnetic flux, thereby inducing a current.Options involving uniform electric fields are incorrect because electric fields do not contribute to the induction of current in this scenario. Furthermore, having both electric and magnetic fields present does not guarantee induced current, as the key factor is the change in magnetic flux. The option 'All of these' is also incorrect because only a uniform magnetic field is sufficient for the induction of current in the context of changing the area of the coil.
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About Electromagnetism
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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