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Electricity & Magnetism

Quick practice

Question 1 of 5

An alpha particle is projected with an initial speed of  \mathrm{v}_{0}=3.2 \times 10^{7} \mathrm{~m} / \mathrm{s} into the uniform field between the parallel plates as shown in the figure.


Screenshot 2021-05-27 185818.png


Assume that the field between the plates is uniform & directed vertically downward & that the field outside the plates is zero.


Given :- mass of \alpha-particle = 4 mass of proton


\mathrm{m}_{\mathrm{p}} \Rightarrow 1.67 \times 10^{-27} \mathrm{~kg}


If the \alpha-particle just misses the lower plate, the time of flight of the \alpha-particle up to this instant is _______.

A

25 \times 10^{-7}

B

6.25 \times 10^{-10}

C

0.625 \times 10^{-8}

D

12.5 \times 10^{-6}

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