1.

Two point charges \({{\rm{q}}_1}\left( {\sqrt {10} {\rm{\mu C}}} \right)\) and q2(-25 μC) are placed on the x-axis at x = 1 m and x = 4 m respectively. The electric field (in V/m) at a point y = 3 m on y-axis is,\(\left[ {{\rm{Take\;}}\frac{1}{{4{\rm{\pi }}{\epsilon_0}}} = 9 \times {{10}^9}{\rm{N}}{{\rm{m}}^2}{{\rm{C}}^{ - 2}}} \right]\)

A. \(\left( {63\hat i - 27\hat j} \right) \times {10^2}\)
B. \(\left( { - 63\hat i + 27\hat j} \right) \times {10^2}\)
C. \(\left( {81\hat i - 81\hat j} \right) \times {10^2}\)
D. \(\left( { - 81\hat i + 81\hat j} \right) \times {10^2}\)
Answer» B. \(\left( { - 63\hat i + 27\hat j} \right) \times {10^2}\)


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