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An electric field and a mangetic field a...

An electric field and a mangetic field act at right angles to each other in a region. The electric field is `E=10^(5)V.m^(-1)` and the magnetic field is B=0.4T. What should be the velcoity of projection of a charge q in a direction perpendicular to both the fields so that it will not be deflected?

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`2.5xx10^(5)m.s^(-1)`
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