Assertion :A charged particle moves along positive y-axis with constant velocity in uniform electric and magnetic fields.If magnetic field is acting along positive x-axis,then electric field should act along positive z-axis. Reason: To keep the charged particle undeviated the relation $\to E = \to B \times \to v$ must hold good.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$_{e} +_{m} = 0$
$∴ q \to E + q (\to v \times \to B) = 0$
$∴ \to E = - (\to v \times \to B) = (\to B \times \to v)$

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The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion→Fe+→Fm=0∴q→E+q(→v×→B)=0∴→E=−(→v×→B)=(→B×→v)

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$_{e} +_{m} = 0$
$∴ q \to E + q (\to v \times \to B) = 0$
$∴ \to E = - (\to v \times \to B) = (\to B \times \to v)$