2. TWO POINT CHARGES \( q_{1}=2.1 \times 10^{-8} \) C AND \( q_{2}=-4 q_{1} \) ARE FIXED IN PLACE \( 50 \mathrm{~cm} \) APART. FIND THE POINT ALONG THE STRAIGHT IINE PASSING THROUGH THE TWO CHARGES AT WHICH THE ELECTRIC FIELD IS ZERO.
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Two Point Charges Two point charges $q_{A}=2.1 \times 10^{-8} \mathrm{C}$ and $q_{B}=-4.0 q_{A}$ are fixed in place $50 \mathrm{~cm}$ apart. Find the point along the straight line passing through the two charges at which the electric field is zero.
(II) Two point charges, $Q _ { 1 } = - 25 \mu \mathrm { C }$ and $Q _ { 2 } = + 45 \mu \mathrm { C }$ are separated by a distance of 12$\mathrm { cm } .$ The electric field at the point $\mathrm { P } ($ see Fig. 58$)$ is zero. How far from $Q _ { 1 }$ is $\mathrm { P }$ ?
(II) Two point charges, $Q_{1}=-25 \mu C$ and $Q_{2}=$ $+50 \mu C,$ are separated by a distance of $12 \mathrm{cm} .$ The electric field at the point $P$ (see Fig. $16-55$ ) is zero. How far from $Q_{1}$ is $P ?$
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