Concept explainers
Whether a resting electron can be set in to motion by a magnetic field or an electric field.
Answer to Problem 15Q
Solution:
A resting electron can be set in to motion by an electric field but not by magnetic field.
Explanation of Solution
The force on a charge in a magnetic field is given by . If charge is at rest, v = 0, hence F = 0 for any value of B. Hence, a resting electron cannot be set in to motion by magnetic field.
The force on a charge in an electric field is given by . Also, from Newtons second law, . Therefore, or , hence a resting electron can be accelerated by electric field.
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