- #1

merdeka

- 6

- 0

- Homework Statement
- An electron, animated by a speed ##\vec{v}## penetrates a uniform magnetic field ##\vec{B}## . The vectors ##\vec{v}## and ##\vec{B}## are orthogonal, the trajectory of the particle is a circle of radius ##R##.

Calculate the module ##\vec{v}## of the electron's velocity.

me = 9,109 382 15 × 10−31 kg

q = 1,602 176 53 × 10−19 C

B = 1,0 T

R = 1,0 cm

- Relevant Equations
- ##F=q\cdot v\cdot B\cdot\cos(\vec{v},\vec{B})##

I'm not sure how I'm able to calculate the velocity of the particle using the formula without knowing the force exerted on it. Also, I don't understand why the question also provides the mass of the electron.