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STD 12 - 4. Moving charges and magnetism — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 4. Moving charges and magnetism4 Marks
Question
Consider the mass-spectrometer as shown in figure. The electric field between plates is $\vec E\ V/m$ , and the magnetic field in both the velocity selector and in the deflection chamber has magnitude $B$ . Find the radius $'r'$ for a singly charged ion of mass $'m'$ in the deflection chamber 
✓

Answer

$\mathrm{q} \mathrm{E}=\mathrm{q} \mathrm{v} \mathrm{B}$

$\mathrm{qvB}=\frac{\mathrm{mv}^{2}}{\mathrm{r}}$

$r=\frac{m v}{q B}=\frac{m E}{q B^{2}}$

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