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Q.

Two charged particles having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of motion. If the ratio of radii of their circular paths is 6 : 5 and their respective masses ratio is 9 : 4. Then, the ratio of their charges will be :

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a

5 : 4

b

5 : 3

c

8 : 5

d

8 : 7

answer is B.

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Detailed Solution

detailed_solution_thumbnail

Radius of circular path R=2mkqB

q=2mkRB

⇒q1q2=m1m2×R2R1=94×56=54

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