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A particle of mass $0.6 g m$ and having charge of $25 n C$ is moving horizontally with a uniform velocity $1.2 \times 10^{4} m s^{- 1}$ in a uniform magnetic field, then the value of the magnetic induction is $(g = 10 m s^{- 2})$

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a

Zero

b

10 T

c

20 T

d

200 T

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detailed solution

Correct option is C

mg=Bqυ B=mgqυ =6×10−4×1025×10−9×1.2×104B=20 T

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