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Posted by ꧁༒Rahul༒꧂ Singh 3 years, 11 months ago
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Gaurav Seth 3 years, 11 months ago
BIOT-SAVART LAW:
- We already know now that current carrying conductor generates magnetic field around themselves. Biot-Savart law just mathematically states the intensity of this magnetic field at a point.
- According to the Biot-Savart law, magnetic field dBdue to current element idl, at a pointP situated at distancer from the current element idl,is:
i) directly proportional to the current element idl, ii) directly proportional to the sine of the angle (θ) between current element and r, and iii) inversely proportional to the square of the distance r between current element and the point
dB∝idl (sinθ)/r2
dB = (μo/4π)×idl×(sinθ)/r2
dB = idl × r / r3
Here proportionality constant is μo/4π = 10-7Tm/A, and μois the permeability of free space (vacuum)
Posted by Asmit Aswal 3 years, 11 months ago
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Ayush Kathait 3 years, 1 month ago
Yogita Ingle 3 years, 11 months ago
An electric dipole is defined as a couple of opposite charges q and –q separated by a distance d. By default, the direction of electric dipoles in space is always from negative charge -q to positive charge q. The midpoint q and –q is called the centre of the dipole. The simplest example of an electric dipole is a pair of electric charges of two opposite signs and equal magnitude separated by distance.
Posted by ꧁༒Rahul༒꧂ Singh 3 years, 11 months ago
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Yogita Ingle 3 years, 11 months ago
Electric field is a force produced by a charge near its surroundings. This force is exerted on other charges when brought in the vicinity of this field.
- SI unit of electric field is N/C (Force/Charge).
- Electric field due to a charge at a point is the force that a unit positive charge would experience if placed at that point.
- The charge generating electric field is called source charge and the charge which experiences this field is called test charge. Practically, to keep source charge undisturbed due to the electric field of test charge, the test charge is kept infinitely small.
- Since F(Force) is proportional to q (Charge), the electric field is independent of q but depends on r (space coordinates).
- The electric field is symmetric in spherical coordinates.
Posted by Alisha Bano 4 years, 1 month ago
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Yogita Ingle 4 years, 1 month ago
Coulomb’s law states that Force exerted between two point charges:
- Is inversely proportional to square of the distance between these charges and
- Is directly proportional to product of magnitude of the two charges
- Acts along the line joining the two point charges.
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Yogita Ingle 4 years, 9 months ago
Huygen's Principle:
(i) Every point on a given wave front (called primary wave front) acts as a fresh source of new disturbance, called secondary wavelets which travel in all directions with the velocity of light in the medium.
(ii) The forward envelope of these secondary wavelets gives the new wave front at any instance.This is called secondary wave front.
Consider a plane wavefront AB incident on a surface PQ separating two media 1 and 2.
The medium 1 is a rarer medium of refractive index n1 in which light travels with a velocity C1 The medium 2 is a denser medium of refractive index n2 in which light travels with a velocity C2.
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Yogita Ingle 4 years, 10 months ago
Coulomb’s Law
Coulomb’s law states that Force exerted between two point charges:
- Is inversely proportional to square of the distance between these charges and
- Is directly proportional to product of magnitude of the two charges
- Acts along the line joining the two point charges.
Posted by Jyoti Arya 4 years, 10 months ago
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Yogita Ingle 4 years, 10 months ago
Brewster’s law:- Brewster’s law states that at any particular angle of incidence, reflected ray is completely polarized; and the angle between reflected and refracted ray is 900.
Posted by Ankit Bohra 4 years, 11 months ago
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