Charged particles passing through a bubble chamber, leave tracks consisting of s

Question

Charged particles passing through a bubble chamber, leave tracks consisting of small hydrogen gas bubbles, These bubbles make visible the particles trajectories. In following figure, the magnetic field is directed into the page, and the tracks are in the plane of the page, in the directions indicated by the arrows 7. Which of the tracks correspond to positively charged particles? a) tracks C & D b) tracks C & E c) only track C d) track D e) only track e 8. If all three particles have the same mass and charges of equal magnitude, which is moving the slowest? a) all have the same speed b) track C c) track D d) track E 9. If all three particles are moving with the same speed and have chares of equal magnitude, which has the greatest mass? a) all have the same mass b) track C c) tracd D d) track E

Explanation / Answer

Q7: (d) track D. F=VxB. Track D satisfies the condition.

Q8: (b) using the formula r = mv/qB, since mass and charge are equal therefore r is proportional to v. Since r is minimum for track C therefore option (b) is correct option

Q9: (c) . using the formula r = mv/qB, since speed and charges are same therefore r is proportional to m. Since r is maximum for D hence the answer

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