Question

A proton and an -particle enters a uniform magnetic field moving with the same speed. If the proton Takes 25s to make 5 revolutions, what is the periodic time for the -particle?

• A. 50 s
• B. 25 s
• C. 10 s
• D. 5 s

Answer 1

Answer: (D)

5 s

$\begin{array}{c}\text{Given- * A proton in a unitoom Magnetic field}\\ \text{* It takes}25\text{seconds for}5\text{revolutions .}\\ \text{we know that in a uniform magnetic field the}\\ \text{speed and time period of the charged particle}\\ \text{remains constant all the time.}\end{array}$

$\begin{array}{c}\text{For}5\text{revolutions,}T=25\text{sec}\\ \Rightarrow \text{for}1\text{revolution, time taken}=5\text{sec.}\end{array}$