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
B
0.8mA
C
1.2mA
D
1.6mA

Solution

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

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