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Two resistances have lengths in the ratio 1:4 and radius 1:2,specific resistances in ratio 3:1. compare their resistances.Solution)Given lengths l1=1 l2=4Given radius r1=1 r2=2 Given specific resistances Ρ(rho)1=3 Ρ2= 1we know the R=Ρl/A R1/R2=3/1.
Explain Newton's First Law In 1665, at the age of 23, Newton developed his famous Laws of Motion. They are commonly known as Newton's first, second and third law. Aside from th
Methods of Demagnetization: 1. A magnet loss it's magnetic properly when it is heated strongly. 2. Practically a magnet can be demagnetized by hammering when it is placed in
A 10 kilogram body initially moving with a velocity of 10 meters per second makes a head-on collision with a 15 kilogram body initially at rest. The two objects stick together. W
It takes 46.0 J to raise the temperature of an 10.1 g piece of unknown substance from 13.0 o Cto 40.1 o C. What is the specific heat for the substance?
Direction of Acceleration and Velocity Knowing the size of a distance or speed is frequently meaningful for creating comparisons. For example, for some reasons it may be enough
Ferrites are (A) Ferromagnetic material. (B) Ferrimagnetic materials. (C) Anti ferromagnetic material. (D) Diamagnetic materials. Ans: Ferrites are ferro
DUE TO SURFACE TENSION WATER MOLECULES TEND TO HAVE MINIMUM SURFACE AREA AND SPHERE HAS THE MINIMUM SURFACE AREA FOR A GIVEN VOLUME AND THEREFORE BUBBLES ARE IN SPHERICAL SHAPE ONL
In a movie, Tarzan evades his captors by hiding underwater for many minutes while breathing through a long , thin reed . Assuming the maximum pressure difference his lungs can mana
Thermistors Insulators and semi-conductors behave in a different way when the temperature increases, because their resistivity decreases. That is: the resistance of an insulato
Magnitude of K.E. in an orbit is equal to: (1)Half of the potential energy (2)Twice of the potential energy (3)One fourth of the potential energy (4 ) None
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