(a) State Coulomb's law of electrostatics. (2 marks)
(b) Two point charges of $+2\ \mu$C and $+3\ \mu$C are placed $30$ cm apart in air. Calculate the force between them and state whether it is attractive or repulsive. (Take $\dfrac{1}{4\pi\varepsilon_0} = 9 imes 10^9$ N m$^2$ C$^{-2}$.) (5 marks)
(c) Calculate the electric field intensity at a point $20$ cm from a point charge of $+4\ \mu$C in air. (4 marks)
(d) Define electric field intensity and electric potential at a point, and state the SI unit of each. (4 marks)

Question

(a) State Coulomb's law of electrostatics. (2 marks)
(b) Two point charges of $+2\ \mu$C and $+3\ \mu$C are placed $30$ cm apart in air. Calculate the force between them and state whether it is attractive or repulsive. (Take $\dfrac{1}{4\pi\varepsilon_0} = 9 	imes 10^9$ N m$^2$ C$^{-2}$.) (5 marks)
(c) Calculate the electric field intensity at a point $20$ cm from a point charge of $+4\ \mu$C in air. (4 marks)
(d) Define electric field intensity and electric potential at a point, and state the SI unit of each. (4 marks)

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Answer

A) null

Answer

B) null

Answer

C) null

Answer

D) null

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