Question

What is the time rate of work done by the magnetic field on a test charge, when it follows as helical path?

• A. $q_{0}B{v}^2$
• B. $q_{0}B$
• C. $\frac{q_{0}B}{v}$
• D. Zero

Answer 1

Answer: (D)

Zero

A magnetic field is never able to do any work on a charged particle moving in it, whatever may be the angle.