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Answer the following questions:(a) Quarks inside protons and neutrons are thought to carry fractional charges $[(+2 / 3) e ;(-1 / 3) e] .$ Why do they not show up in Millikan’s oil-drop experiment?(b) What is so special about the combination e/m? Why do we not simply talk of e and $\mathbf{m}$ separately?
Answer the following questions:
(a) Quarks inside protons and neutrons are thought to carry fractional charges $[(+2 / 3) e ;(-1 / 3) e] .$ Why do they not show up in Millikan’s oil-drop experiment?
(b) What is so special about the combination e/m? Why do we not simply talk of e and $\mathbf{m}$ separately?
CBSE | Class 12 | Dual Nature of Radiation and Matter | NCERT | Physics
Answer the following questions:
(a) Quarks inside protons and neutrons are thought to carry fractional charges $[(+2 / 3) e ;(-1 / 3) e] .$ Why do they not show up in Millikan’s oil-drop experiment?
(b) What is so special about the combination e/m? Why do we not simply talk of e and $\mathbf{m}$ separately?

(a) Inside protons and neutrons, quarks are considered to have fractional charges $[(+2 / 3) \mathrm{e} ;(-1 / 3) \mathrm{e}] .$ This is due to the fact that when nuclear forces are separated, they become stronger. As a result, fractional charges appear to exist in nature. Electrical charges are an inherent multiple of visible charges (e)

(b) The relation between magnetic field electric field,

$\mathrm{eV}=(1 / 2) \mathrm{mv}^{2}$ and $\mathrm{eBv}=\mathrm{mv}^{2} / \mathrm{r}$

Here,

$e=$ electric charge

$v=$ velocity

$\mathrm{V}=$ potential

$r=$ Radius

$B=$ magnetic field

The dynamics of an electron can be determined only by the ratio $\mathrm{e} / \mathrm{m}$ , not by e and m separately, as can be seen from these equations.

i

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