Question

a)if the length of wire is doubled how is resistivity change it
b) why did insulator get charged by friction
c) what's the force between two electrons separated by 1 micrometre
d) why is the tungsten more coil in the bulb
plz gave all answer correctly I needed tomorrow is my exam

Answer 1

B ). Insulators can be easily charged by friction as the extra electrons gained CANNOT easily escape. Conductors: materials that allow electrons to flow through them easily. Conductors CANNOT be easily charged by friction as the extra electrons gained can easily escape.

C ) To solve the problem we have to use Coulomb's Law. The question is directly analogous to the Universal Gravitation equation, because both follow the Inverse Square law, so one should look familiar if you've seen the other. 

The law states:



F =  



Where the letter q and Q are two electrical charges. R is the distance between the two letters, and k is the Coulomb constant. Now the only thing is to plug in the given values.



Here, R = 1 m



Therefore the required force  =



(9 × 10⁹ N·m²/C²)(1.6 × 10ˉ¹⁹ C)(1.6 × 10ˉ¹⁹ C) / 1² m²


= 2.3 × 10ˉ²⁸ N

D ). It contains a thin coil of wire called the filament. This heats up when an electric current passes through it and produces light as a result. Incandescent light bulbs have filaments which are made mainly from the element tungsten, the metal element used for the filaments in incandescent light bulbs.



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