Two point charges Q and -q are held 'r' disapart in free space. A uniform electric field…
Physics · Class 12 · CBSE — Electric Charges and Fields
Two point charges Q and -q are held 'r' disapart in free space. A uniform electric field \(\vec{E}\) is applied in the region perpendicular to the line joining the two charges. Which one of the following angles will the direction of the net force acting on charge \(-q\) make with the line joining Q and -q?
- \(\tan ^{-1} \frac{4 \pi \varepsilon_{0} {Er}^{2}}{{Q}}\)
- \(\cot ^{-1} \frac{4 \pi \varepsilon_{0} {Er}^{2}}{{Q}}\)
- \(\tan ^{-1} \frac{{QE}}{4 \pi \varepsilon_{0} {r}^{2}}\)
- \(\cot ^{-1} \frac{{QE}}{4 \pi \varepsilon_{0} {r}^{2}}\)
Answer
(B) ^ -1 4 _ 0 Er ^ 2 Q
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