An electron has mass $9 \times 10^{-31} \ kg$ and charge $1.6 \times 10^{-19} \ C$ is moving with a velocity of $10^6 \ m/s$. It enters a region where a magnetic field exists. If it describes a circle of radius $0.10 \ m$,the intensity of the magnetic field must be:

  • A
    $1.8 \times 10^{-4} \ T$
  • B
    $5.6 \times 10^{-5} \ T$
  • C
    $14.4 \times 10^{-5} \ T$
  • D
    $1.3 \times 10^{-6} \ T$

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