Ampere’s swimming rule :
If a man sets himself floating in the direction of the current facing the coil, then the north pole of a magnetic needle is deflected towards his left hand.
Laws of refraction of light
Laws of refraction of light :
(i) A
ray of light passing from a rarer medium into a denser medium is deviated towards the normal at the point of striking the common surface of the two media. The ray is deviated away from the normal when the ray of light passes from a denser medium into a rarer one. (ii) The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant and is called the refractive index of the second medium with respect to the first medium. The second law is called the Snell’s Law.
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Principle of lever
Principle of lever :
In the case of equilibrium of a rod (called lever) under two forces, the forces are to each other inversely as the lengths of lever arms from the fulcrum, i.e. the products of the forces by the length of their lever arms are equal. In case more than two forces act upon the rod, the algebraic sum of the. moments of all the forces about the fulcrum is equal to zero.
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Law of conservation of mass or matter
Law of conservation of mass or matter :
Matter can neither be created nor destroyed. The sum total of mass or matter for any system always remains constant without any increase or decrease in their quantity.
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Newton’s law of Cooling
Newton’s law of Cooling :
The rate at which a body cools or loses heat to its surroundings is proportional to the excess of
mean temperature of the body over that of the surroundings provided this temperature excess is
not too large.
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