An electron with kinetic energy 1.50 keV circles in a place perpendicular to a uniform magnetic field. The orbit radius is 30.0 cm. Find the speed of…

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An electron with kinetic energy 1.50 keV circles in a plane perpendicular to a uniform magnetic field. The orbit radius is 30.0 cm. Find the speed of the electron and the magnitude of the magnetic field B. (m_e = 9.11 × 10⁻³¹ kg, q_e = 1.6 × 10⁻¹⁹ C, 1eV = 1.6 × 10⁻¹⁹ J)

  1. 3.2 × 10⁸ ms⁻¹, 6.2 mT
  2. 4.8 × 10⁸ ms⁻¹, 0.62 mT
  3. 5.3 × 10⁷ ms⁻¹, 4.4 mT
  4. 2.3 × 10⁷ ms⁻¹, 0.44 mT ✓

Explanation

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