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Gaurav Seth 7 years ago
Whenever the magnetic flux linked with a closed circuit changes, an emf is set up across it which lasts only as long as the change in flux is taking place. This emf is called induced emf.
According to Faraday's law of electromagnetic induction, the magnitude of induced emf is equal to the rate of change of magnetic flux linked with the closed circuit (or coil).
Mathematically,
where,
N is the number of turns in the circuit and,
ΦB is the magnetic flux linked with each turn.
Suppose the conducting rod completes one revolution in time T.
Then,
Change in flux = B x Area swept
= B x l2
Therefore,
But,
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Gaurav Seth 7 years ago
- An electric line of force is an imaginary straight or curved path along which a small positive test charge is supposed to move when free to do so.
- The tangent at a point on an electric line of force gives the direction of the resultant electric field at that point.
- The relative closeness of electric lines of force in a certain region provides us an estimation of the electric field strength in that region.
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Gaurav Seth 7 years ago
In unpolarized light the light vibrate in all possible planes but for polarised light the vibrations occur in a single plane.
The reflected wave will be totally polarised if reflected wave and refracted wave are perpendicular to each other.
If the incident angle is ip and refracted angle r then
ip+90∘+r=180∘⇒r=90∘−ip ip+90°+r=180°⇒r=90°-ip
Then according to Snell's law
μ=sinipsinr⇒μ=sinipsin(90∘−ip)⇒μ=sinipcosip⇒μ=tanip μ=sinipsinr⇒μ=sinipsin90°-ip⇒μ=sinipcosip⇒μ=tanip
where μμ is the refracted index of the transparent medium. This is called Brewster's law and ip is called the Brewster angle.
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Priyanka Paul 6 years, 11 months ago
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