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Question

A negatively charged particle is moving through a magnetic field as pictured below.
What is the direction of the force on the particle due to the magnetic field at the instant in the picture?
498341_9c7f418af834464ab318ee23d843fa55.png

A
North
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B
West
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C
East
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D
Up
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E
Down
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Solution

The correct option is E Down
From figure, v=v ^y B=B ^x
Magnetic force on the particle F=q(v×B)
F=q[(v)^y×B^x]=qvB(^y×^x)=qvB ^z
Thus magnetic force on the particle acts downwards (i.e into the page).

555360_498341_ans_089fe01f08c54fb5a11c3bf6f8bbc9d9.png

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