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Question

What is the direction of magnetic force on the negatively charged particle q which enters a magnetic field, as shown in the figure?


A
Left
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B
Right
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C
Upward
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D
Downward
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Solution

The correct option is A Left
Given:


From the given information, we can take the directions of v and B along Y and Z directions, respectively.

So, ^v=^j and ^B=^k

Where, ^j and ^k are unit vectors along Y and Z directions, respectively.


Now, the direction of magnetic force on a charged particle is,

^Fm=^v×^B=^j×^k=^i

As the charge q is negative, so the direction of F will be towards left.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, option (A) is correct.

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->

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