Question

A charged particle in a uniform magnetic field $\vec{B}=B_0\hat{k}$ starts moving from the origin with velocity $v=3\hat{i}+4\hat{k}$ m/s.The trajectory of the particle and the time $t$ at which it reaches 2m above the x-y plane are

• A. Circular path, $\frac{1}{2}$sec.
• B. Helical path, $\frac{1}{2}$ sec.
• C. Circular path, $\frac{2}{3}$sec.
• D. Helical path, $\frac{2}{3}$ sec.

Answer 1

Answer: (A)

Circular path, $\frac{1}{2}$sec.

Answer 2

The correct answer is option (A): Circular path, $\frac{1}{2}$sec.