Moving Charges and Magnetism

Question: An electron having charge $1.6 \times {10^{ - 19}}\,C$ and mass $9 \times {10^{ - 31}}\,kg$ is moving with $4 \times {10^6}\,m{s^{ - 1}}$ speed in a magnetic field $2 \times {10^{ - 1}}\,tesla$ in a circular orbit. The force acting on electron and the radius of the circular orbit will be



1) $12.8 \times {10^{ - 13}}N,\,1.1 \times {10^{ - 4}}m$
2) $1.28 \times {10^{ - 14}}N,\,1.1 \times {10^{ - 3}}m$
3) $1.28 \times {10^{ - 13}}N,\,1.1 \times {10^{ - 3}}m$
4) $1.28 \times {10^{ - 13}}N,\,1.1 \times {10^{ - 4}}m$
Solution: Explanation: No Explanation
Motion of Charged Particle In Magnetic Field

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