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  • A particle of charge -q moves with a velocity v in a magnetic field B as shown in Fig <img alt="" src="https://cdn.entrance360.com/media/uploads/2023/08/17/16.png" style="height

A particle of charge -q moves with a velocity v in a magnetic field B as shown in Fig

The direction of the magnetic field on the particle will be 

Option: 1

to the left


Option: 2

downward in the plane of the page


Option: 3

out of the plane of the page


Option: 4

into the plane of the page


Answers (1)

best_answer

\mathrm{\boldsymbol{F}=-q(\boldsymbol{v} \times \mathbf{B})} . The direction of \mathrm{(\boldsymbol{v} \times \mathbf{B})} is out of the page. Since \mathrm{-(v \times \mathbf{B})=(\mathbf{B} \times v)} we have
\mathrm{ \mathbf{F}=q(\mathbf{B} \times \boldsymbol{v}) }
The direction of \mathrm{ (\mathbf{B} \times \boldsymbol{v}) }  is into the page. So the correct choice is (d).

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