An electron has mass $9 \times {10^{ - 31}}\,kg$ and charge $1.6 \times {10^{ - 19}}C$ is moving with a velocity of ${10^6}\,m/s$, enters a region where magnetic field exists. If it describes a circle of radius $0.10\, m$, the intensity of magnetic field must be
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(b) $B = \frac{{mv}}{{qr}} = \frac{{9 \times {{10}^{ - 31}} \times {{10}^6}}}{{1.6 \times {{10}^{ - 19}} \times 0.1}} = 5.6 \times {10^{ - 5}}\,T$
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