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PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Velocity selector

Check the force directions first

A positive particle enters along +x. The uniform electric field is 6000 V/m along +y and the magnetic field is 0.30 T along +z, out of the xy plane.

+v along +xE along +y6000 V/m⊙ B = 0.30 T, out of the page (+z)
The arrows show velocity and electric field. Determine the magnetic force direction before balancing forces.

Find the speed for undeflected motion.

Organize the givens & assumptions
  • E = 6000 V/m along +y
  • B = 0.30 T along +z
  • Velocity along +x

Fields and velocity are mutually perpendicular; negligible gravity and other forces; nonrelativistic particle.

  1. A6.0×103 m/s6.0\times10^3\ \mathrm{m/s}
  2. B2.0×104 m/s2.0\times10^4\ \mathrm{m/s}
  3. C1.8×103 m/s1.8\times10^3\ \mathrm{m/s}
  4. D5.0×10−5 m/s5.0\times10^{-5}\ \mathrm{m/s}

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