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Q.

Value of permittivity in free space is

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a

8.85×10-10C2/Nm2

b

88.5×10-12C2/Nm2

c

8.85×10-12C2/Nm2

d

0.885×10-12C2/Nm2

answer is A.

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Detailed Solution

F=14πε0×q1q2r2

r=1m,F=1N, q1=1C, q2=1C

14πε0=9×109Nm2C2

ε0=14π×9×109

=1×1094×3.14×9

=0.008846×109

=8.85×1012C2Nm2

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