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| Numerical 12 |
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| 12. An electron is projected with a speed of 105ms-1 at right angles to a magnetic field of 0.019 G. Calculate the radius of the circle described by the electron. |
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| Suggested solution: |
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| Let R be the radius of the circular path described by the electron. |
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| Then mv2/R = B e v or R = mv/B e. |
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| Given: B = 0.019; G = 0.019 x 10-4; T = 1.9 x 10-6 T |
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| Therefore, R = 9.1 x 10-31 x 105/1.9 x 10-6 x 1.6 x 10-19 |
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| = 0.299m |
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Moving Charges and Magnetism
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