First slide
Force on a charged particle moving in a magnetic field
Question

A particle of charge 16  ×  1018  C moving with velocity 10  m  s1 along x-axis  enters a region where a magnetic field of induction B exists along the y-axis and an electric  field of magnitude 104 V/m exists along the negative z-axis. If the charged particle continues moving along the x-axis, the magnitude of B is

Easy
Solution

Since particle is moving undeflected.

So, qE=qvBB=E/v=10410=103  Wb/m2

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