Assertion :If an electron, while coming vertically from outerspacce enter the earth's magnetic field, it is deflected towards west. Reason: Electron has negative charge.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$Solution :$
1. We know that the direction of the earth's magnetic field is towards north and the velocity of electron is vertical downwards.
2. Applying Flemings's left hand rule, the direction of force is towards west.
3. Therefore, an electron coming from outer space will be deflected towards west.

$Hence B is the correct option$

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