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Q.

A uniform magnetic field acts right angles to the. direction of motion of electrons. As a result, the electron moves in a circular path of radius 2 cm. If the speed of electrons is doubled, then the radius of the circular path will be

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a

2.0 cm

b

0.5cm

c

4.0 cm

d

1.0cm

answer is C.

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Detailed Solution

r=mvqB  or  r∝vAs v is doubled, the radius also becomes double. Hence radius = 2x2= 4cm.
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