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Question

If an electron revolves in the path of a circle of radius $$0.5\times10$$$$^{-10}$$$$m$$ at a frequency of $$5\times10$$$$^{15}$$ cycles/s, the electric current in the circle is (charge of an electron $$=$$ 1.6 x 10$$^{-19}$$)


A
0.4mA
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B
0.8mA
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C
1.2mA
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D
1.6mA
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Solution

The correct option is B $$0.8mA$$
$$ I = \dfrac{\Delta Q}{t}$$
     $$ = 1.6 \times 10^{-19} \times 5 \times 10^{15}$$
     $$ = 8 \times 10^{-4}$$
$$ I = 0.8  mA$$

Physics
NCERT
Standard XII

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