A coil is placed near a magnet. Emf will be induced in it when
Correct answer: D. All of these
- A. Area of coil is changed
- B. Magnet which was placed at a distance is moved closer to it.
- C. Coil is rotated
- D. All of these
Explanation
Faraday's law of electromagnetic induction states that an electromotive force (EMF) is induced in a conductor when the magnetic flux through the conductor changes.Changing Area: If the area of the coil changes, the magnetic flux through the coil changes, inducing an EMF.Moving Magnet: Moving the magnet closer to the coil increases the magnetic field strength and therefore the magnetic flux through the coil, inducing an EMF.Rotating Coil: Rotating the coil in a magnetic field changes the angle between the magnetic field lines and the coil's area, leading to a change in magnetic flux and inducing an EMF.
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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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