Haytham002

Arab Acadmey For Science & Technology and Maritime

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What does charge means? what does charge of electron = -1.6 x 10 -19 mean? is it the force of attractive or repulsion of electron then why the unit of charge is Coulomb not Newton?? is it the size of electron??(and that's mean that Coulomb is much smaller than micro meter?)i mean what does charge refer to? i read about oil drop experiment but i didnt get what charge is or refer to what. another question: why when we want to measure the force between two charges we use this rule: F = K (Q1*Q2)/r2 not the gravitational force between two bodies F = G (m1*m2)/r2? Please help I'm very confused and i have a quiz tomorrow!

conservation of charge electric charge

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What does charge means? what does charge of electron = -1.6 x 10 -19 mean? is it the force of attractive or repulsion of electron then why the unit of charge is Coulomb not Newton?? is it the size of electron??(and that's mean that Coulomb is much smaller than micro meter?) i mean what does charge refer to? another question: why when we want to measure the force between two charges we use this rule: F = K (Q1*Q2)/r2 not the gravitational force between two bodies F = G (m1*m2)/r2? Please help I'm very confused and i have a quiz tomorrow!

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i want to know what is the meaning of second derivative?(slope of slope?) i knew it's the rate of change of the slope of the tangent on the curve so how does the sec. derivative get this rateofchange?

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