Physics · Force on a moving charge in uniform magnetic and electric fields
A strong magnetic field is applied on a stationary electron. Then
A strong magnetic field is applied on a stationary electron. Then
- A. the electron moves in the direction of the field
- B. the electron moves in an opposite
- C. the electron remains stationary
- D. the electron starts spinning
Step-by-step solution
The magnetic force on a charged particle is F = q(v × B). Since the electron is initially stationary (v = 0), the magnetic force is zero, so the electron does not acquire translational motion. While the electron has intrinsic spin, the magnetic field exerts a torque that can align or precess the spin, but it does not cause the electron to 'start spinning' or move translationally. Therefore, the electron remains stationary.
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