q1, q2, q3 and q4 are point charges located at points as shown in the figure and S is a spherical Gaussian surface of radius R. Which of the following is true according to the Gauss’s law
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a
∮s(E→1+E→2+E→3).dA→=q1+q2+q32ε0
b
∮s(E→1+E→2+E→+E→4).dA→=(q1+q2+q3)ε0
c
∮s(E→1+E→2+E→3).dA→=(q1+q2+q3+q4)ε0
d
None of the above
answer is B.
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Detailed Solution
By using ∫E→⋅ dA→=1ε0(Qenc)Electric field is due to all charges & Qenc= charges enclosed in the gaussian surface