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Raman Brar 6 years, 5 months ago
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Sia ? 6 years, 5 months ago
Self-Inductance: Self-inductance is the property of a coil by virtue of which, the coil opposes any change in the strength of current flowing through it by inducing an emf in itself. Self-inductance of a coil is equal to the magnetic flux linked with the coil when unit current flows through it.
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Yogita Ingle 6 years, 5 months ago
Self induction is that phenomenon in which a change in electric current in a coil produces an induced emf in the coil itself.
Now, it is also known as inertia of electricity as for if we were to change electric current through a current carrying coil it will tend to oppose any further change in its emf. This is similar to inertial behavior in mechanics were bodies in either rest or motion tend to oppose any change in their state. Here mass is the inertial property analogous to self inductance.
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Yogita Ingle 6 years, 5 months ago
Coulomb’s Law is formula or quantitative aspect of electricity which gives an idea about force between two point charges. By the word point charge, we mean that in physics, the size of linear charged bodies is very small compared to the distance between them, so we consider them as point charges as it becomes easy for us to calculate the force of attraction/ repulsion between them.
Generally, the statement, let’s say there are two charges q1 and q2. The distance between the charges is ‘r’, and the force of attraction/repulsion between them is ‘F’. Then
F ∝ q1q2
F ∝ 1/r2
F = k q1q2/ r2
where k is proportionality constant and equals to 1/4 π ε0, the symbol ε0 is called epsilon naught and it signifies permittivity of a vacuum.
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A type of energy fueled by the transfer of electrons from positive and negative points within a conductor. Electricity is widely used for providing power to buildings, electric devices, and even some automobiles.
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Gaurav Seth 6 years, 5 months ago
Faraday’s laws of Induction
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)
Gurucharan Singh 6 years, 5 months ago
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Rohit Singh 6 years, 5 months ago
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