. \( +4.0 \mu \mathrm{C} \), are fixed in place and separated by \( 3.0 \mathrm{~m} \). (a) At what the positive charge. What would be the forint: The spot does not necessarily lie between the two charges.) (b) on a charge of \( -5.0 \mu \mathrm{C} \) placed at this spot? Ans: \( (3 \mathrm{~m}, 0 \mathrm{~N}) \)
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Two charges, -16 and $+4.0 \mu \mathrm{C},$ are fixed in place and separated by $3.0 \mathrm{~m} .$ (a) At what spot along a line through the charges is the net electric field zero? Locate this spot relative to the positive charge. (Hint: The spot does not necessarily lie between the two charges.) (b) What would be the force on a charge of $+14 \mu \mathrm{C}$ placed at this spot?
Three point charges are placed at the following locations on the $x$ axis: $+2.0 \mu \mathrm{C}$ at $x=0,-3.0 \mu \mathrm{C}$ at $x=40 \mathrm{~cm},-5.0 \mu \mathrm{C}$ at $x=120$ $\mathrm{cm}$. Find the force $(a)$ on the $-3.0 \mu \mathrm{C}$ charge, $(b)$ on the $-5.0 \mu \mathrm{C}$ charge.
Three point charges are placed at the following points on the x-axis: +2.0 ?C at x = 0, ?3.0 ?C at x = 40cm,?5.0 ?C at x = 120cm. Find the force (a) on the ?3.0 ?C charge, (b) on the ?5.0 ?C charge. (Ans. (a) -0.55 N; (b) 0.15 N)
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