Question

An electron is moving through a magnetic field. If the velocity of the electron is doubled, the magnetic force experienced by the electron will

A. Stay the same
B. Double
C. Triple
D. Quadruple

Answer 1

B. Double

Step-by-step explanation:

As we know that the magnetic force on moving electron is given as

`F = q(\vec v * \vec B)`

now we will have

`F = qv B sin\theta`

here we know that the velocity of the electron is doubled and rest all components remains the same

so we will have

`F' = q(2v)B sin\theta`

so the new force will be double that of initial force on the electron so correct answer will be

B. Double