Find Q1 - Electrostatics - Electromagnetic Field

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Point charges Q1 and Q2 are, respectively, located at ( 4, 0, - 3) and ( 2, 0, 1). If
Q2 = 4 nC, find Q1 such that
(a) The Eat (5, 0, 6) has no z-component
(b) The force on a test charge at (5, 0, 6) has no x-component.

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In Coulomb's general law, the electric field is equal to the product of the two charges. Here, why did you put a plural between the two charges? Can you explain that?!

drem_
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Why u calculate only common z(in video 3/4minute) ..

MiMi-tbzm
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Point charges Q1 and Q2 are respectively located at (4, 0, -3) and (2, 0, 1). If Q1=4nC, find
another point charge when
i) Electric field intensity on a charge at a point (5, 0, 6) has no z-component.
ii) Force on a charge at a point (5, 0, 6) has no x-component.

kashwin
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can i ask what is the reference of the book ?

novenvillaber