Question

2. Two charges of values $Q_1 = +4 \times 10^{-8} C$ and $Q_2 = -3 \times 10^{-8} C$ are placed 4 cm apart in vacuum as shown in Figure 1. ($\epsilon_0 = 8.85 \times 10^{-12} F\ m^{-1}$). Point A is the midway between the two charges. Point B is 2cm directly below point A. (a) Draw the direction of electrostatic force on charge $Q_1$. (1 mark) (b) Calculate the magnitude of the electrostatic force on $Q_1$. (2 marks) (c) Calculate the intensity of the electric field at Point A by going through the following calculation steps: (i) Electric field at point A due to charge $Q_1$ (2 marks) (ii) Electric field at point A due to charge $Q_2$ (2 marks) (iii) Magnitude of the electric field at point A (1 mark) (iv) Draw the direction of the electric field at point A (1 mark) (d) Calculate the intensity of the electric field at Point B by going through the following calculation steps: (i) Electric field at point B due to charge $Q_1$ (2 marks) (ii) Electric field at point B due to charge $Q_2$ (2 marks) (iii) Magnitude of the electric field at point B (3 marks) (iv) Draw the direction of the electric field at point B (1 marks)

          2.
Two charges of values $Q_1 = +4 \times 10^{-8} C$ and $Q_2 = -3 \times 10^{-8} C$ are placed 4
cm apart in vacuum as shown in Figure 1. ($\epsilon_0 = 8.85 \times 10^{-12} F\ m^{-1}$). Point A
is the midway between the two charges. Point B is 2cm directly below
point A.
(a) Draw the direction of electrostatic force on charge $Q_1$. (1 mark)
(b) Calculate the magnitude of the electrostatic force on $Q_1$. (2 marks)
(c)
Calculate the intensity of the electric field at Point A by going
through the following calculation steps:
(i) Electric field at point A due to charge $Q_1$
(2 marks)
(ii) Electric field at point A due to charge $Q_2$
(2 marks)
(iii) Magnitude of the electric field at point A
(1 mark)
(iv) Draw the direction of the electric field at point A
(1 mark)
(d) Calculate the intensity of the electric field at Point B by going
through the following calculation steps:
(i) Electric field at point B due to charge $Q_1$
(2 marks)
(ii) Electric field at point B due to charge $Q_2$
(2 marks)
(iii) Magnitude of the electric field at point B
(3 marks)
(iv) Draw the direction of the electric field at point B
(1 marks)

2.
Two charges of values Q1 = +4 × 10^-8 C and Q2 = -3 × 10^-8 C are placed 4
cm apart in vacuum as shown in Figure 1. (ϵ0 = 8.85 × 10^-12 F m^-1). Point A
is the midway between the two charges. Point B is 2cm directly below
point A.
(a) Draw the direction of electrostatic force on charge Q1. (1 mark)
(b) Calculate the magnitude of the electrostatic force on Q1. (2 marks)
(c)
Calculate the intensity of the electric field at Point A by going
through the following calculation steps:
(i) Electric field at point A due to charge Q1
(2 marks)
(ii) Electric field at point A due to charge Q2
(2 marks)
(iii) Magnitude of the electric field at point A
(1 mark)
(iv) Draw the direction of the electric field at point A
(1 mark)
(d) Calculate the intensity of the electric field at Point B by going
through the following calculation steps:
(i) Electric field at point B due to charge Q1
(2 marks)
(ii) Electric field at point B due to charge Q2
(2 marks)
(iii) Magnitude of the electric field at point B
(3 marks)
(iv) Draw the direction of the electric field at point B
(1 marks)

Added by Catherine R.

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