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Q.

A particle of charge -q moves with a velocity v in a magnetic force B as shown in figure:

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The direction of the magnetic field on the particle will be:

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a

out of the plane of the page 

b

downward in the plane of the page

c

into the plane of the page 

d

to the left

answer is D.

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Detailed Solution

 F=-qv×B.

The direction of v×B is out of the page.

Since  -v×B=B×v, we have  F=qB×v.

The direction of (B×v) is into the page.

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