Question

The magnetic field is downward perpendicular to the plane of the paper and a few charged particles are projected in it. Which of the following is true

• A. A represents proton and B and electron
• B. Both A and B represent protons but velocity of A is more than that of B
• C. Both A and B represents protons but velocity of B is more than that of A
• D. Both A and B represent electrons, but velocity of B is more than that of A

Answer 1

Answer: (C)

Both A and B represents protons but velocity of B is more than that of A

Answer 2

Both particles are deflecting in same direction so they must be of same sign.(i.e., both A and B represents protons)

By using $\Rightarrow$

From given figure radius of the path described by particle B is more than that of A. Hence $v _ { B } > v _ { A }$