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An electron is moving along +x direction...

An electron is moving along +x direction with a velocity of `6 xx 10^6 ms^(-1)` . It enters a region of uniform electric field of 300 V/cm pointing along + y direction. The magnitude and direction of the magnetic field set up in this region such that the electron keeps moving along the x direction will be :

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The correct Answer is:
`3.4xx10^(-4)T`
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