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Q.

Two point charges qA = 3 μc and qB = -3μc are located 20cm apart in vacuum . What is the electric field at the mid point of the line joining the two charges.
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a

54 x10-6N/C along OB

b

54 x10-6N/C along OA

c

5.4 x10-6N/C along OB

d

5.4 x10-6 N/C along OB

answer is B.

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Detailed Solution

E=E¯1+E2¯=14πε03×10610×10−22+3×10−610×10−22=2×9×109×3×10−610−2=54×105
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=5.4×106N/c along OB

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