In a certain region of space electric field E and magnetic field B are perpendicular ot each other and an electron enters region perpendicular to the direction of B and E both and moves undeflected, then velocity of electron is

\frac{∣ E ∣}{∣ B ∣}

E \times B

\frac{∣ B ∣}{∣ E ∣}

E . B

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Question Text

In a certain region of space electric field E and magnetic field B are perpendicular ot each other and an electron enters region perpendicular to the direction of B and E both and moves undeflected, then velocity of electron is

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