Question

What happens to an electron beam when a uniform magnetic field is applied at right angles to it?

• A. The beam is deflected in a circular path
• B. The beam is deflected in a parabolic path
• C. The beam starts oscillating
• D. The beam remains uneffected

Answer 1

Answer: (A)

The beam is deflected in a circular path

$\begin{array}{c}\overrightarrow{F}=-e(\overrightarrow{v}\times \overrightarrow{B})\\ \gamma =\frac{mv}{eB}\\ \text{The e^{-} beam will}\\ \text{move in circular}\\ \text{path.}\end{array}$

Correct option A