Assertion :A proton moves horizontally towards a vertical long conductor having an upward electric current. It will deflect vertically downward. Reason: Seeing the proton and the conductor from the side of the proton, the magnetic field at the site of the proton will be be towards right. Hence the force $\to F = q \to v \times \to B$ will deflect the proton vertically downward.

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

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Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
Seeing the proton and the conductor from the side of the proton, the magnetic field at the site of the proton will be be towards right. Hence the force $\to F = q (\to v \times \to B)$ will deflect the proton vertically downward.

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