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Q.

In a crossed field, the magnetic field induction is 2.0T and electric field intensity is 20×103v/m. At which velocity, the electron will travel in a straight line without the effect of electric and magnetic fields ?

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a

10×103ms−1

b

40×103ms−1

c

201.6×103ms−1

d

20×103ms−1

answer is B.

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Detailed Solution

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QVB=QE⇒V=EB=20×1032=10×103m/s

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