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irga5000 [103]
4 years ago
15

An electron and a proton, moving side by side at the same speed, enter a 0.020-T magnetic field. The electron moves in a circula

r path of radius9.0 mm. What is the radius of the proton?
Physics
1 answer:
agasfer [191]4 years ago
4 0

Answer:

16.5 m

Explanation:

Given,

Magnetic field = 0.02 T

radius of electron = 9 mm

speed of electron  = speed of proton

radius of proton = ?

We know,

F_e = q_e vB.........(1)

F_p = q_p vB

using newton second law

F = m a = m\dfrac{v^2}{r}

equating Force due to electron and proton

F_e = F_p

\dfrac{m_ev^2}{r_e}=\dfrac{m_pv^2}{r_p}

\dfrac{m_e}{r_e} = \dfrac{m_p}{r_p}

m_ e = 9.1 x 10⁻³¹ Kg    and m_p = 1.67 x 10⁻²⁷ Kg

r_p = \dfrac{m_p}{m_e}\times r_e

r_p = \dfrac{1.67\times 10^{-27}}{9.1 \times 10^{-31}}\times 9 \times 10^{-3}

r_p = 16.5 m

Hence, the radius of proton is equal to 16.5 m.

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