Question

If an electron is revolving in a circle of radius with frequency of rotation 6.25 x 1018 Hz in clockwise direction then current on the
circumference of the circle is:

Answer 1

Answer:

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Explanation:

Given: an electron revolving in the path of a circle of radius of 0.5×10  

−10

m at a frequency of 5×10  

15

 cycles/sec

To find the electric current in the circle

Solution:

The formulas used

current=  

time

charge

​  

 

and Time period=  

frequency

1

​  

 

and distance=2πr

According to the question, r=0.5×10  

−10

m, frequency = 5×10  

15

 cycles/sec

Therefore, current=2πr× frequency

⟹current=2×3.14×0.5×10  

−10

×5×10  

15

 

⟹current=15.7×10  

5

A

is the required electric current in the circle