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Question

# A particle of charge −16×10−18 coulomb moving with velocity 10 m/s along the x-axis enters a region where a magnetic field of induction B is along the y-axis, and an electric field of magnitude 104V/m is along the negative z-axis. If the charged particle continues moving along the x-axis, the magnitude of B is

A
103 Wb/m2
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B
103 Wb/m2
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C
105 Wb/m2
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D
1016 Wb/m2.
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Solution

## The correct option is B 103 Wb/m2Particles is moving undeflected in the presence of both electric field as well as magnetic field. So its speed is, v=EB⇒ B=Ev=10410=103Wb/m2.

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