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Q.

A cathode ray beam is bent in a circle of radius 2.0 cm by a uniform field with B=9.1×10−3 T. What is the speed of the electrons?

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a

1.0×10−6 m/s

b

1.2×10−7 m/s

c

3.2×10−7 m/s

d

4.2×10−6 m/s

answer is C.

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Detailed Solution

v=rqBm=2×10−2×1.6×10−19×9.1×10−39.1×10−31=3.2×107 m/s
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