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(3} (b) (5} id} {E} if) Consider two equal point charges separated by a distance d. If a third test charge is inserted at a

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(3} (b) (5} id} {E} if) Consider two equal point charges separated by a distance d. If a third test charge is inserted at a point exactly midway between the two charges, what is the amount of net force the third charge would experience? State what happens when-.- i. Two like charges are brought into close proximity to each other. ii. Two unlike charges are brought into close proximity to each other. State the units for resistivity and for current density. It the electric potential at a distance of 5cm from an isolated positive point charge is +100V, determine the magnitude of this charge. Use the given formula. V : g 47:30}? A rectangular carbon block with its dimension is shown in Figure 1. h=2cm w=2cm I=60cm Figure 1 Given the resistivity of carbon at 20C is p=3.5x10J-3m, calculate the resistance measured between the two square ends. Use the given formula. A resistor has a resistance of 300 is connected across a battery of emf 8V] Determine:- i. The current. ii- The len'ninal voltage of the battery. iii. The power delivered by the emf. iv. The power delivered to the extemal resistance. (2 marks) (2 marks) (2 marks) (2 marks) (2 marks) (2 marks) (2 marks) (2 marks) (2 marks) (2 marks)

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