Electromagnetic Induction
Madhya Pradesh Board · Class 12 · Physics
Summary of Electromagnetic Induction for Madhya Pradesh Board Class 12 Physics. Key concepts, important points, and chapter overview.
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Electromagnetic induction is the production of an emf, and sometimes current, in a circuit because the magnetic flux linked with it changes with time. The phenomenon was established through experiments by Michael Faraday and Joseph Henry around 1830. It forms the basis of electric generators, transf
Key Concepts
Magnetic flux through a surface measures
Magnetic flux through a surface measures how much magnetic field passes through it. For a uniform field, it is given by Φ_B = B·A = BA cos θ. For a no
The induced emf in a circuit
The induced emf in a circuit is equal to the negative time rate of change of magnetic flux through it: ε = -dΦ_B/dt for one turn and ε = -N dΦ_B/dt fo
The polarity of induced emf
The polarity of induced emf is such that it tends to produce a current which opposes the change in magnetic flux that produced it. This is why the neg
When a conductor of length l
When a conductor of length l moves with speed v perpendicular to a magnetic field B, the induced emf is ε = Blv. This can also be understood using the
When current changes in one coil
When current changes in one coil, a changing magnetic flux is produced in a nearby coil and induces emf in it. For two long coaxial solenoids, M12 = μ
Learning Objectives
- Understand magnetic flux and how it is calculated for uniform and nonuniform fields.
- Explain the experimental results that led to the discovery of electromagnetic induction.
- Apply Faraday’s law to find induced emf in changing magnetic situations.
- Use Lenz’s law to determine the direction of induced current.
- Derive and use the motional emf formula for a moving conductor.
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