Appeared in: 2026 (2 sets)
An electron is moving in a circular path in a uniform magnetic field of $3\cdot14 \times 10^{-4}\text{ T}$. Its period of revolution will be approximately :
(A) $0\cdot11\text{ }\mu\text{s}$
(B) $0\cdot28\text{ }\mu\text{s}$
(C) $0\cdot014\text{ }\mu\text{s}$
(D) $0\cdot024\text{ }\mu\text{s}$