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light year is the unit of distance..not light plz correct sir

Is the magnitude of one charge constant (1.6x10*-19)? If so, then by Coulomb's law, can the force be changed only by a change in distance?

If pdf is there please send me 9738407757 whatsapp number ...i am preparing for physics teacher exam ...help me sir thank you sir

@akki: the impurities added to semiconductors don't always provide free electrons eg impurities of 15th group.

@akki

Hello,

Thanks for keep in touch with us. I have resolved all problems.

Metal is good conductor of electricity because of more free electron

Earth is rotate from west to east so stars looks like rotate east to west

And the capillary tube with unequal length the presure are not maintained so the water fill not flow

And semiconductor main impurity conductivity ko increase karta hai because of more free elctron

Sir kuch question ke answer galat hai like which vector main three carbon dating fossil ke liye

Nice intiative continue