An electron (mass $= 9 \times 10^{-31}\,kg$. Charge $= 1.6 \times 10^{-19}\,C$) whose kinetic energy is $7.2 \times 10^{-18}$ $joule$ is moving in a circular orbit in a magnetic field of $9 \times 10^{-5} \,weber/m^2$. The radius of the orbit is.....$cm$
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(d) $r = \frac{{\sqrt {2mE} }}{{qB}} = \frac{{\sqrt {2 \times 9 \times {{10}^{ - 31}} \times 7.2 \times {{10}^{ - 18}}} }}{{1.6 \times {{10}^{ - 19}} \times 9 \times {{10}^{ - 5}}}}$
= $0.25\, m = 25\, cm$
= $0.25\, m = 25\, cm$
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