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An electron moves with a speed of 8.0 × 106 m/s along the +x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x axis and lying in the xy plane. Calculate the magnetic force of the electron.Group of answer choices2.8 × 10-12 N3.2 × 10-12 N2.8 × 10-10 N3.2 × 10-10 N

Question

An electron moves with a speed of 8.0 × 106 m/s along the +x axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x axis and lying in the xy plane. Calculate the magnetic force of the electron.Group of answer choices2.8 × 10-12 N3.2 × 10-12 N2.8 × 10-10 N3.2 × 10-10 N

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Solution

Para calcular la fuerza magnética sobre el electrón, utilizamos la fórmula de la fuerza magnética:

F=qvBsin(θ) F = q \cdot v \cdot B \cdot \sin(\theta)

donde:

  • F F es la fuerza magnética,
  • q q es la carga del electrón (q=1.6×1019 q = -1.6 \times 10^{-19} C),
  • v v es la velocidad del electrón (v=8.0×106 v = 8.0 \times 10^6 m/s),
  • B B es la magnitud del campo magnético (B=2.5 B = 2.5 T),
  • θ \theta es el ángulo entre la velocidad del electrón y el campo magnético (θ=60 \theta = 60^\circ ).

Primero, calculamos el seno del ángulo:

sin(60)=32 \sin(60^\circ) = \frac{\sqrt{3}}{2}

Ahora, sustituimos los valores en la fórmula:

F=(1.6×1019C)(8.0×106m/s)(2.5T)(32) F = (-1.6 \times 10^{-19} \, \text{C}) \cdot (8.0 \times 10^6 \, \text{m/s}) \cdot (2.5 \, \text{T}) \cdot \left(\frac{\sqrt{3}}{2}\right)

Calculamos paso a paso:

  1. 8.0×106m/s2.5T=2.0×107T\cdotpm/s 8.0 \times 10^6 \, \text{m/s} \cdot 2.5 \, \text{T} = 2.0 \times 10^7 \, \text{T·m/s}
  2. 2.0×107T\cdotpm/s32=1.732×107T\cdotpm/s 2.0 \times 10^7 \, \text{T·m/s} \cdot \frac{\sqrt{3}}{2} = 1.732 \times 10^7 \, \text{T·m/s}
  3. 1.6×1019C1.732×107T\cdotpm/s=2.7712×1012N -1.6 \times 10^{-19} \, \text{C} \cdot 1.732 \times 10^7 \, \text{T·m/s} = -2.7712 \times 10^{-12} \, \text{N}

La magnitud de la fuerza es:

F=2.8×1012N F = 2.8 \times 10^{-12} \, \text{N}

Por lo tanto, la respuesta correcta es:

2.8×1012N 2.8 \times 10^{-12} \, \text{N}

This problem has been solved

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