1.a) State Coulomb's Law.
b) State one major application of Gauss' Law.
c) Two charges Q1=300μC and Q2= 100μC are located on the XY plane at positions
ri =3j meters and r2 = 4i meters. Find the force exerted on Q2

2. a) What is Electric Potential?
b) What is a dipole?
c) Two point charge Q₁ = 10uC and Q2=-2μC are along the x-axis at x=0 and x = 4m, respectively.
Find the equipotential point along the x-axis
.
Section B
1) (a) A cell of emf 1.5V is connected in series with a resistance of 0.4 ohms. If a high-resistance voltmeter
connected across the cell registers 0.8V. Calculate the internal resistance of the cell. (b) Three cells
of emf 3V and internal resistance of 0.5 ohms are connected in parallel to reduce the total potential
difference across the circuit. (i) Determine the effective internal resistance of the cell if the
resistance of the resistor is 4 ohms. (ii) Calculate the current. (c) State in each why, egth of wire,
cross sectional area, temperature, and nature of material are factors that affect the tistance of a
wire.
(i) Explain the theory of resistivity. (ii) Explain the relationship each between areas of plates.
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