$A$ magnetic field is applied on an electron moving with a velocity of $10^7 \,m/s$ at an angle of $30^{\circ}$ to the magnetic field. The time period of revolution of the electron in a circular path of radius $2 \,m$ is . . . . . .
- A$5.5 \times 10^{-6} \,s$
- B$7.0 \times 10^{-7} \,s$
- C$2.5 \times 10^{-6} \,s$
- D$3.5 \times 10^{-7} \,s$
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