Q.

A proton of mass 1.6×10-27 kg and charge 1.6×10-19 C is projected with a speed of 2×106m/s at an angle of 60° to the x-axis. If a uniform magnetic field of 0.104 tesla is applied along y-axis, the path of proton is

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a

a circle of radius = 0.1 m and time period 2π×10-7s

b

a helox of radius = 0.1 m and time period 4π×10-7s

c

a circle of radius = 0.2 m and time period π×10-7s

d

a helox of radius = 0.2 m and time period 2π×10-7s

answer is C.

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Detailed Solution

r = mvsin30° = (1.67×10-27)×(2×106)sin30°1.6×10-19×0.104 = 0.1m T =2πmqB = 2π×1.67×10-271.6×10-19×0.104 = 2π×10-7s

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