1.

If an electron revolves in the path of a circle of radius of \[0.5\text{ }\times \text{ }{{10}^{10}}m\]at frequency of \[5\text{ }\times \text{ }{{10}^{15}}cycles/s\]the electric current in the circle is (Charge of an electron \[=\text{ }1.6\text{ }\times \text{ }{{10}^{19}}C\]) [EAMCET 2000]

A.            0.4 mA
B.                                      0.8 mA
C.            1.2 mA                                    
D.            1.6 mA
Answer» C.            1.2 mA                                    


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