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NEET 2016
Exam
NEET
Year
2016
Subject
Physics
Chapter
Magnetic Effects of Current

NEET 2016 · Physics · Magnetic Effects of Current

An electron is moving in a circular path under the influence of a...

An electron is moving in a circular path under the influence of a transverse magnetic field of 3.57×10−2T3.57 \times {10}^{- 2}T. If, the value of em\dfrac{e}{m} is 1.76×1011Ckg−11 .76 \times {10}^{11}C{kg}^{- 1}, the frequency of revolution of the electron is

Options

  1. A1GHz1\text{GHz}
  2. B100MHz100\text{MHz}
  3. C62.8MHz62.8\text{MHz}
  4. D6.28MHz6.28\text{MHz}

Correct answer

A. 1GHz1\text{GHz}

Step-by-step solution

f=qB2\pim=1.76×1011×3.57×10−22×3.14f = \dfrac{qB}{2\pim} = \dfrac{1.76 \times {10}^{11} \times 3.57 \times {10}^{- 2}}{2 \times 3.14}

=109Hz=1GHz= {10}^{9}Hz = 1GHz.

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