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Yogita Ingle 7 years ago
First law: -
- According to the first law an emf is induced in the circuit whenever the amount of magnetic flux linked with a circuit changes.
- Current was induced because of magnetic flux, as there is some current in the circuit therefore there will be some emf flowing in the circuit.
- Whenever the amount of magnetic flux linked with the circuit changes only at that time emf is induced.
- The induced emf will be there till there is change in the flux.
- When the magnet was moved then only there was change in the flux.
- As the magnet is moving the number of magnetic lines crossing the area is also changing.
- There is a change in the flux therefore there is induced emf.
- If the magnet is not moving, there will be no change in the amount of magnetic flux so there is no induced current.
Second law: -
- According to the second law the magnitude of the induced emf in a circuit is equal to the time rate of change of magnetic flux through the circuit.
- Emf which is induced will depend upon rate at which the magnetic flux is changing.
- Mathematically:-
- Let Φ1 = flux at initial time t=0.
- Φ2 = flux after time t.
- Rate of change of flux=(Φ2 – Φ1)/t =dΦ/dt
- According to Faraday’s law:-
- Induced emf e ∝ (dΦ/dt)
- Experimentally the constant of proportionality was found to be 1 in all cases.
- Therefore e=(dΦ/dt)
- Consider a coil which has N number of turns;Therefore
- e = N(dΦ/dt)
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Yogita Ingle 7 years ago
- An electrical generator is a device that converts mechanical energy to electrical energy.
- The generation of alternating currents (ac) is based on the phenomenon of electromagnetic induction.
- Whenever the magnetic flux changes an emf will be induced in the coil.
- AC generator is a device that converts mechanical energy into electrical energy(alternating currents).
- AC generator is an example of inducing an emf or current in a loop by varying the magnetic field and area vector.
Principle:-
- Current is induced in a loop through a change in its orientation or a change in its effective area.
- Induced emf is produced either by changing θ or by changing the area vector.
- Direction of current is given by Fleming’s right hand rule.
- Direction of the current in the circuit changes by the up and down movement of the loops.
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Aryan Rai 7 years ago
2Thank You