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Q.

A  charged particle enters into a uniform transverse magnetic field of 0.5 T with a kinetic energy 0.4 eV from a boundary and complete half  revolution in 5 ms and emerges out from boundary. The kinetic energy with which it emerges is 

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a

0.2eV

b

0.4eV

c

0.04eV

d

0.02eV

answer is B.

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Detailed Solution

W.D by magnetic field on charged  particle=0

⇒ΔKE=0

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