Magnetic Force

Radius of circular path but Or Or Or

The magnetic force on a charged particle moving in a magnetic field is given by the equation: Where: - is the charge of the particle - is the velocity of the particle - is the magnetic field - is the angle between the velocity vector and the magnetic field vector. For the magnetic force to be maximum, must be maximum. The maximum value of is 1, which occurs when . Thus, the magnetic force is maximum when the angle between and is . Hence, the correct answer is (D) 90°.

Force on a current carrying conductor is: Since the wire is perpendicular to the field: Given: So,
Hence, the correct answer is:

Step 1: Understanding the Concept:
A magnetic field exerts a force on a charged particle only when the particle is in motion relative to the magnetic field.
Step 2: Key Formula or Approach:
The Magnetic Lorentz Force is given by: In magnitude:
Step 3: Detailed Explanation:
For a stationary electron, the velocity .
Substituting into the force equation: Since there is no magnetic force acting on the stationary electron, there is no change in its state of rest.
Therefore, the electron will remain stationary.
Step 4: Final Answer:
The electron remains stationary.