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Physics Electric Fields 1 mark question help??? watch

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    Attachment 608632

    I don't understand , please help.
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    what is the question?
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    Name:  two point particles.PNG
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    (Original post by glad-he-ate-her)
    what is the question?
    I'm trying to upload the picture, can you see it?
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    (Original post by Jas1947)
    Attachment 608632

    I don't understand , please help.
    at a distance d, the force between the particles is F. At a distance of 20mm, the force is 0.5F. If you use the equation Force=kQ1Q2/r^2, you should gte 2 expressions for f, one in terms of d. You then just solve for d.
    I got an answer of 14mm to 2sf.
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    id say its B because the relationship is an inverse square , so if distance decreases force will increase to 1F which will be at 14mm
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    (Original post by an_atheist)
    at a distance d, the force between the particles is F. At a distance of 20mm, the force is 0.5F. If you use the equation Force=kQ1Q2/r^2, you should gte 2 expressions for f, one in terms of d. You then just solve for d.
    I got an answer of 14mm to 2sf.
    Ah yes! I forgot the squared on the distance. Thanks!!
 
 
 
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