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Answer : a
Solution : By coulomb's law the electrostatic force
F = 1/4πε0(q1q2/r^{2})
⇒ε0 = 1/4πF(q1q2/r^{2})
Substituting the unit for q, r,and F , we abtain unit of
ε0 = coulomb×coulomb newton−(metre)^{2}
= (coulumb)^{2} newton −(meter)^{2}
=C^{2}N−m^{2}
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