Question

name the physical quantity whose S.I unit is NC -1

Answer 1

The answer is electric field intensity.

Electric field intensity is the force per unit positive charge which the charge exerts at any point.

Electric field intensity= force(newton)÷charge(coulomb).

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Answer 2

Electrostatic Field Intensity has SI UNIT as N/C .

• N/C means Newton per Coulomb.

• Newton (N) is the SI UNIT of force and Coulomb (C) is the SI UNIT of charge.

• Now, as per Coulomb's Law:

$F = \dfrac{k {q}^{2} }{ {d}^{2} }$

• 'q' is the charge and 'd' is the separation distance. Now field intensity (E) will be :

$\implies E = \dfrac{F}{q}$

$\implies E = \dfrac{ \dfrac{k {q}^{2} }{ {d}^{2} } }{q}$

$\boxed{ \implies E = \dfrac{ k q }{ {d}^{2} }}$

Hence , the unit is N/C.