A uniform magnetic field is at right angle to the direction of motion of protons. As a result, the protons describe a circular path of radius 2 .5 cm. If the speed of the protons is doubled, then the radius of the circular path will be
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a
0.5 cm
b
2.5 cm
c
5.0 cm
d
7.5 cm
answer is C.
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Detailed Solution
mv2r=evB or r=(mv/eB)When v is doubled, r is also doubled, i.e., 5.0 cm.