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An electron moving with a speed of 4.2 × 105 m/s in the
Chapter 22, Problem 14P(choose chapter or problem)
Problem 14P
An electron moving with a speed of 4.2 × 105 m/s in the positive × direction experiences zero magnetic force. When it moves in the positive y direction, it experiences a force of 2.0 × 10−13 N that points in the negative z direction. What are the direction and magnitude of the magnetic field?
Questions & Answers
QUESTION:
Problem 14P
An electron moving with a speed of 4.2 × 105 m/s in the positive × direction experiences zero magnetic force. When it moves in the positive y direction, it experiences a force of 2.0 × 10−13 N that points in the negative z direction. What are the direction and magnitude of the magnetic field?
ANSWER:
Step 1 of 2:-
Here, we have to calculate the magnitude and direction of the magnetic field.
When the electron is moving in +ve x direction, the magnetic force is zero.
When the particle is moving in +ve y direction, the magnetic force is zero.
This means that, the magnetic field is antiparallel to x direction or in the -ve x direction, according to .
But, the charged particle is an electron for which the magnetic field will be in +ve x direction.
The speed of the particle is,
.